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Live exams this week: JEE Main Physics Weekly Test, 2026-11-15 16:30Join the series free →Live exams this week: NEET Weekly Test (Biology), 2026-11-21 16:30Join the series free →
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  • JEE Main→Engineering entrance, at the real exam pace.PhysicsChemistryMathematicsBITSATWBJEEReal exam: 75 questions in 3 hours125 mock tests · 3,674 questions · 984 problems Next live test: 2026-11-15 16:30
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JEE Advanced→
The IIT paper: harder problems that join several ideas.
PhysicsChemistryMathematics
Marks off for a wrong answer
Real exam: Two papers, 3 hours each
10 mock tests · 1,708 questions · 955 problems
  • NEET→Medical entrance, each subject at its own pace.PhysicsChemistryBiologyClass 11 and 12Real exam: 180 questions in 3 hours139 mock tests · 3,954 questions · 1,148 problems Next live test: 2026-11-21 16:30
  • Olympiads→From the national first round to the camps for the international team.PhysicsChemistryMathematicsBiologyCalculus in PhysicsWritten solutions in Mathematics56 mock tests · 2,433 questions · 1,300 problems
  • Board Exams→Chapter-by-chapter practice for the school boards.PhysicsChemistryMathematicsBiologyClass 10Class 12CBSE and NCERT-based boards165 mock tests · 8,586 questions · 4,273 problems
  • Python Certification→Practice for the Python Institute certificates.PythonPCEPPCAPReal exam: PCEP: 35 questions, 50 minutes. PCAP: 42 questions, 65 minutes5 mock tests · 572 questions · 256 problems
    • SAT→SAT Math practice, topic by topic.MathematicsAlgebraData analysisProblem solving23 mock tests · 818 questions · 355 problems
    • AP→College-level practice, topic by topic.PhysicsChemistryBiologyCalculusStatistics146 mock tests · 5,317 questions · 1,642 problems
    • A-Level→UK A-Level practice, topic by topic.PhysicsChemistryMathematicsBiology274 mock tests · 8,706 questions · 2,857 problems
    • IB→IB Diploma practice, topic by topic.PhysicsChemistryMathematicsBiologyHigher LevelStandard Level274 mock tests · 8,727 questions · 2,851 problems
    • Olympiads→Problem-solving contests, from national rounds to the international papers.PhysicsChemistryMathematicsBiologyCalculus in PhysicsWritten solutions in Mathematics56 mock tests · 2,433 questions · 1,300 problems
    • Python Certification→Practice for the Python Institute certificates.PythonPCEPPCAPReal exam: PCEP: 35 questions, 50 minutes. PCAP: 42 questions, 65 minutes5 mock tests · 572 questions · 256 problems
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    PhysicsHigh School (11–12)

    Combining Capacitors and Stored Energy

    Capacitors together and the energy they hold. Series and parallel combinations, energy stored in a charged capacitor, and what happens to charge and energy when capacitors are joined or a battery stays connected.

    StemPy LabStemPy LabView Course →
    ChemistryHigh School (11–12)

    Redox and Electrode Potentials

    A redox reaction split into two half-cells. The Daniell cell, standard electrode potentials and the electrochemical series. Then how to predict whether a reaction will happen and which metals displace which.

    StemPy LabStemPy LabView Course →
    Python ProgrammingHigh School (11–12)

    The Periodic Table as Data

    Load the elements into a pandas table, sort and filter them, plot the periodic trends, and look for patterns: which properties go together, and which elements break the rule.

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    Featured Problems

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    MediumPython solutionPython Programming

    Use a Caesar cipher with a shift of 3. Encode HELLO. Decode KHOOR. What does XYZ become?

    text processing

    StemPy LabStemPy LabTry Problem →
    MediumPython solutionPython Programming

    A line has the form name:mark, such as Asha:72…

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    MediumPython solutionPython Programming

    Follow the generator

    comprehensions and generators

    StemPy LabStemPy LabTry Problem →
    EasyPython solutionPython Programming

    Predict the output

    getting started with python

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    Blog

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    How to study a problem so that you remember it

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    Study advice

    StemPy LabStemPy Lab · 23 October 2026 · 2 min read
    A test paper with four green ticks and one red cross, a stopwatch a third of the way round, and a certificate with an orange seal.

    How to hold a mock test: a step-by-step guide for teachers

    Get your questions ready, build a paper marked like the real exam, choose how it starts, run it, read the report and give certificates. Then take the same paper to students beyond your class with an open exam. A walk through a demo class test.

    Mock testsTeachersGuides

    StemPy LabStemPy Lab · 22 October 2026 · 8 min read
    A question palette of coloured squares and circles, green, red, purple and grey, beside a large stopwatch more than half way round.

    How to take a mock test: a step-by-step guide for students

    Find the right paper, read the instructions, use the exam screen like the real JEE or NEET, understand the marking, and turn every wrong answer into marks. Then sit open exams and the Live Series with students everywhere.

    Mock testsExamsGuides

    StemPy LabStemPy Lab · 22 October 2026 · 7 min read
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    • Experiments with Circuits, Lenses and Diodes
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    • Titrations and Preparations: Volumetric Analysis and Laboratory Syntheses
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    • Cumulative Frequency Curves
    • Mode and Median of Grouped Data
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    Cells, living things, how they work and how they are connected.

    128 courses1380 problems258 labs
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    • The Cockroach, with the Earthworm and the Frog
    • Muscular and Neural Tissue, Organs and Organ Systems
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    Python Programming

    Learn to program from your first line of code, with every example running in your browser.

    40 courses480 problems239 labs
    Latest
    • Waves by Computer: Adding and Fitting
    • Angles, the Unit Circle and Trigonometric Graphs
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    Statistics & Data Science

    Learn to make sense of data, from your first table and graph to averages, spread, chance and the ideas behind every report you read.

    7 courses68 problems15 labs
    Latest
    • The Weather Project
    • Chance
    Explore Statistics & Data Science →

    Test yourself: mock tests and exams

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    Open exams

    Live series
    >_
    JEE Main Physics Weekly Test

    by StemPy Lab

    • 2026-11-15 16:30
    • 60 minutes
    • 25 questions
    • Free
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    Leading this month

    • 1Samraj Chakrabarty
    • 2Suhaan
    • 3Tiasha
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    Share
    • Everyone starts together
    • Your score and rank the moment it ends
    • A certificate for everyone who takes it
    Live series
    >_
    NEET Weekly Test (Biology)

    by StemPy Lab

    • 2026-11-21 16:30
    • 50 minutes
    • 90 questions
    • Free
    • Then Physics
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    Leading this month

    • 1Anouhita Kar
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    Live series
    >_
    JEE Main Physics Weekly Test

    by StemPy Lab

    • 2026-11-22 16:30
    • 60 minutes
    • 25 questions
    • Free
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    days
    –
    hrs
    –
    min
    –
    sec
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    One tap registers you for this sitting and every one after it; skip any you like.

    Leading this month

    • 1Samraj Chakrabarty
    • 2Suhaan

    Practise for your exam

    • Coding Test · Python Programming47 papers
    • Olympiad · Mathematics16 papers
    • Olympiad · Physics16 papers
    • Olympiad · Chemistry15 papers
    • Olympiad · Biology9 papers
    • Exam Practice · Statistics & Data Science7 papers
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    Recently held here

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      StemPy Lab

      Open exam

      NEET Weekly Test (Chemistry) · 14 Nov 2026

      Chemistry · High School (11–12) · 2026-11-14

      12 took itOpen →

    • >_

      StemPy Lab

      Open exam

      JEE Main Physics Weekly Test · 8 Nov 2026

    Samadrita
  • 3SRIJEET SAMADDAR
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    • Everyone starts together
    • Your score and rank the moment it ends
    • A certificate for everyone who takes it
  • Timed at the real exam's pace
  • Marked the moment you finish, with every answer explained
  • Linked to the lessons it tests, so you know what to study next

    • Physics · High School (11–12) · 2026-11-08

    6 took itOpen →

  • Arghya Sen

    Arghya Sen

    Class test · 2 classes

    Paper kept private

    Physics, Chemistry, Biology · High School (11–12) · 2026-11-06

    3 took it in 2 classesOpen →

    • Papers to try

    All papers →
    • Board ExamStress, Strain and Hooke's Law: Practice PaperStemPy Labby StemPy Lab20 min · 15 questionsStart now
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    • JEE AdvancedGases and Liquids: Advanced Chapter TestStemPy Labby StemPy Lab55 min · 15 questionsStart now
    • OlympiadSeparating Mixtures: Challenge TestStemPy Labby StemPy Lab20 min · 10 questionsStart now
    • MHT-CETMHT-CET PCM Mock Paper 1StemPy Labby StemPy Lab180 min · 150 questionsStart now
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    • Coding TestPython Certification: PCAP Mock Test 2
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    65 min · 40 questions
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  • OlympiadStatistics: Chapter TestStemPy Labby StemPy Lab50 min · 20 questionsStart now
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  • Coding TestPython Certification: PCEP Mock Test 3StemPy Labby StemPy Lab40 min · 30 questionsStart now
  • OlympiadCyclic Quadrilaterals: Challenge TestStemPy Labby StemPy Lab20 min · 10 questionsStart now
  • Coding TestPython Certification: PCEP Mock Test 2StemPy Labby StemPy Lab40 min · 30 questionsStart now