hi,

see you have already taken year gap and currently enrolled for class 11 science. however till now you have around 2 years to prepare for jee main. jee main is a mcq based exam and first of all your 10+2 syllabus should be Crystal clear to you. unless your conception for pcm is good you can not solve the mcq papers.

so try to forget all the negative views of not cracking exam and right now focus only completing your 11th course.

make short notes and practice numerical problems to acquainted with the  short tricks and faster problem solving.

hope it would help.