You want to prepare for JEE Advanced it means you are keen to get IIT tag. In order to crack your paper you should be determined and self motivated. it's not very easy to gather all your concentration and dedication to re-study the jee course once you are admitted to a college.

In order to prepare for it go through the whole syllabus, Focus on important topics, make your important notes. Solve previous year papers, MCQs and mock test series for your practice.

All the Best!!