Hello Ansh,
To get very good marks in Jee main is CONSISTENCY.
You should remain consistent in study and effort for one year.
Firstly do your 11th syllabus with full dedication.
Books list for jee   main:
https://engineering.careers360.com/articles/best-books-for-jee-main-2019
LIMITED BOOK BUT MULTIPLE REVISION.

Some suggestions to get good marks.
1.Build concepts by using YouTube video , NPTEL video,etc medium.
2. Use book bank for practicing questions.
For difficult question marks circle and do revision of that questions on monthly basis
3.Consistent to cover the course on the time period.
4.Guidance from successful candidate and teachers
5.Keep motivated towards you and your goal is one of the most important thing.

If any queries remain than comment below.
Good luck ...

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