NEST stands for National Entrance Screening Test conducted by NIISER Bhubaneswar. The exam basically comprises of four sections,

Biology,

Mathematics,

Physics

Chemistry.

It's rather easy for you to prepare because the syllabus is same as your 10+2 syllabus. You just need to prepare for one more section which you can do in bit by but. If you belong to maths stream you need to prepare for Biology and if you belong to biology stream you need to prepare for maths.

I know a bit of hard work will be required but once you will crack the exam everything will be worth it.

Tips.

Plan a proper schedule or routine to give time for the preparation of both exams consecutively.

Try solving past year question papers.

Try to give mocks in order to analysze the time management.

Don't stress much and keep your confidence till the end.

All the Very best.

Thank you.