Hello,

English and Social Science are two most important subjects in NDA exam and cannot be ignored. They contain a good weightage. Here are few tips which will help you in preparing English in right way:

1. Please have a look on Previous years question papers to know what kind of questions are asked.
2. Restrict yourself to demand of paper.
3. Read as much as you can.
4. Try to give as many mock tests as possible.

Here are few tips for social science:

1. Social science has many factual things like years, king names, etc. so try to revise them as frequently as possible.
2. Restrict yourself to demand of exam.
3. Try to make your own mnemonics
4. Revise as many times as possible else you will slowly start loosing the concepts.
5. Clear your concepts instead of mugging up everything.

I hope you are satisfied with the answer.

ALL THE BEST!