First, you need to be sure about which programme/course you are interested in as per your qualification. You need to meet eligibility criteria, of course, to get into it. Your qualification percentage matters to qualify eligibility condition of the particular desired programme.
LPUNEST exam plays a role of eligibility in some courses and in a maximum number of courses plays the role of scholarship. Its purpose will be clearly defined to you in eligibility condition of the programme/course which will help you to know that it’s necessary to give or not for your desired course.Same you can view by exploring desired programme detail from LPU official website http://www.lpu.in
Courses that LPU offers, LPUNEST for eligibility condition is compulsory in some of them and in many courses to avail maximum scholarship benefits one can give it as per his/her choice where mandatory condition of giving it is not specified.