Hello aspirant,

Hope you are doing well.

As per your question, according to you your 12th board exam will be in 2022 so as of now you have enough time for you to score good marks in 12th.As you didn't mentioned your stream but no problem you can still go with NCERT books as NCERT book cover each and every topic effectively. As if you read thoroughly only NCERT book also then  also you can get good marks in any entrance exams .

Hope this information helps you out. Thank you.