By only limiting preparation to JEE, yet if done seriously, you may just be able to clear the JEE Main Cut, or in simpler terms secure just above 90-93 Percentile. Assuming you are General/OBC you wont really secure a good seat at this Score. For better preparation for JEE, you need to get a step ahead and target anywhere above 96 Percentile for better Scope and Prospects during Counselling ,irrespective of the Fact whether you are General or belong to certain Category.

Do follow the link below for more information and preparation tips

https://engineering.careers360.com/articles/jee-main-preparation-tips/amp