Hello Ansh,Lpunest 2019 exam have two schedule 

Schedule 1:21st jan - 5feb 2019

Schedule 2:5th april - 30th april

You can give any schedule exam,only best of one will be considered.If you not satisfied with Schedule 1 test paper than you have chance to appear in Schedule 2 test paper.If any candidate is satisfied with his/her first marks than he/she may not give Schedule 2 test paper.Lpunest is great exam for getting a scholarship in a college for various courses.

Hopes this helps you.For know further about lpunest follow this link:https://nest.lpu.in/engineering/index.php