Hello Yash, 

I have given NDA 3 times and have cleared all of them, so the things you must start doing from now onwards are, 

• READ NEWSPAPER DAILY
• READ GOOD GK BOOKS
• FOCUS ON MATHS BASICS
• VERY BASIC LEVEL OF PHYSICS AND CHEMISTRY 
• IF POSSIBLE READ BIOLOGY ALSO, BUT IF TIME PERMITS BECAUSE WITHOUT ATTEMPTING BIO QUESTIONS ALSO YOU CAN CKEAR THE PAPER. 
• GOOD GRIP OVER CALCULATION AND MATHS. 

Follow this routine.

The NDA-II notification will be announced in the month of August.

So prepare well

I hope you will find my answer helpful. 

All the best.