sir I am 12th passed I want to clear jnu entrance please guide me

Make sure to go through all the portions of your 11th and 12th thoroughly. A good foundation of concepts from higher secondary is the key to clearing any entrance exam.
If you are a cbse students go through NCERT properly. It should be more than enough to secure you a good rank.
If you are aiming for higher rank than use books prepared for entrance tests.
I would suggest HC Verma for physics and RD Sharma for Math.