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Hello,
No worries. There is no percentage critieria for JEE mains. You can prepare from now. You have enough time for JEE mains 2021.
Follow NCERT for maths, physics and chemistry. For reference you can use RD sharma, HC verma for Physics, OP Tandon for chemistry and RD sharma for maths.
if you give your best in performance you can do well. no matter what the previous results were it doesn't matter.
On the part of getting in a government college, If you get a rank below 2-3 lakhs you can get into the college. if you have any reservation category then that would be very helpful.
You can apply apply for your state engineering entrance exam. syllabus is mostly same.
for more book list, visit the link below:-
https://engineering.careers360.com/articles/best-books-for-jee-main
Hope it helps!
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