Whether you need a quick 10-minute revision or a full 3-hour mock exam, PrepXa's AI builds a unique test for you instantly.
Two powerful ways to test your knowledge.
Simulates the real exam pattern (NEET/JEE). Includes questions from all subjects (Physics, Chem, Bio/Maths) with standard time limits and negative marking.
Laser-focused practice. You choose the specific subject, chapters, difficulty, and time. Perfect for mastering weak areas identified by our AI.
From the dashboard, tap the "Create Test" quick action or the dedicated "Practice" tile.
Choose your Class (XI/XII), Subject, and desired Difficulty (Easy/Medium/Hard).
Don't waste time on what you already know. Select only the chapters you want to drill down on.
Use the sliders to set the exact number of questions (10-50) and the time limit.
Generating a premium AI test requires a small fee from your wallet. Users with an Unlimited Plan skip this step.
The standard electrode potential (E°) for Daniel cell is 1.1V. Calculate the standard Gibbs energy for the reaction.