Hello Aspirant

If you are targeting for NIT and for CSE its a sure shot deal that you should have good rank and good marks in JEE MAIN paper.

Well the only thing that will fetch you an NIT is lot of hardwork

As you mentioned that you have a year left.Let us consider that you are done with 50% of your syllabus.

As you will also be giving your 12th this year the main thing you need to focus on is NOTES

Start making notes!

Read all NCERT books throughly

Make a full proof Timetable(Divide time to each subject)

Complete Chemistry inorganic part

Divide your list from easy chap to tough chapters(EASY CHAP THAT CAN FETCH YOU MORE MARKS)

Practice daily

By heart all the formula in Mathematics(maths will fetch you marks)

Physics is tough but first complete easy chapters

Keep all the formula and organic chemistry equation ready and stick it to the wall.Glance through it daily.You will slowly start remembering it

Solve Plethora of Mock test

I know its difficult ,but only hardwork and smartwork will fetch you NIT

Regards!