Learn and Practice with Velnov

Velnov provides online quizzes and practice questions across Python, JavaScript, SQL, Mathematics, Physics, Chemistry, Biology, English and History.

Explore detailed explanations, math formulas and a scientific calculator to support your learning.

• Online quizzes and practice questions — grouped by subject and topic, with different difficulty levels.
• Detailed explanations — understand why an answer is correct and learn from mistakes.
• Programming practice — Python, JavaScript and SQL questions from basics to interview-style practice.
• School subjects — Mathematics, Physics, Chemistry, Biology, English and Indian History.
• Math formula reference — formulas grouped by topic with useful explanations.
• Scientific calculator — tools for trigonometry, powers, roots, logarithms, factorials and constants.

Study notes: every question with its answer

Prefer to read before you test yourself? The Velnov study notes list every quiz question with the correct answer and a full explanation, topic by topic: Python, JavaScript, SQL, Physics, Chemistry, Biology, Indian History, Mathematics and English. The math formula pages explain each formula with its meaning, uses and an example.

Nothing needs to be installed and there is no sign-up. Use the menu to move between quizzes, the formula reference and the calculator.