Students can start preparing for JEE from any class. The earlier you begin, the better it would be. Starting JEE preparation in class 9 or 10 clears the basics (learning key skills) and is called the JEE foundation. For many aspirants, class 11 is the right time to start preparing for JEE.
So 4 to 5 hours study starting from 11th class will be helpful for JEE. As the exam date approaches, say 6 months from the JEE Mains, the study hours need to be increased to 8 hours. Give more focus on revision and solving last year's JEE Mains and Advanced question papers.
How to prepare for JEE Main 2020
Stages of preparation Know your JEE Main 2020 syllabus Understand the exam pattern of JEE Main Make the JEE Main 2020 preparation plan
Books to refer Practice till you are perfect using mock tests and previous year papers
Exam Day Strategy.