All the information pertaining to LPUNEST such as syllabus, previous year question papers, sample papers is given on the lpunest website. You can click on the website and get the required information. Hope this helps. Good Luck

Princey, 

To prepare for Amity Jee, IPU CET,  LPU NEST

you need just need to go through your class 11 and 12 syllabus .

The best according to me for these exam will be NCERT. 

If you want to concern other books 

1) Physics-HC VERMA, SENGAGE,SL ARORA

2)CHEMISTRY- NCERT, BALAJI,ARRIHANT

3)MATHS- RD SHARMA, ML AGGRAWAL, S CHAND. 

Hope it helps