The mandatory requirement to clear LPUNEST is subject to which course you want to seek admission into.
But if you clear a national level exam that is recognised by LPU for admissions and you fulfill the university’s eligibility requirements, you can seek admission into these courses without clearing LPUNEST.
But if you want to be eligible for scholarship, then you will have to clear the exam for these courses as well.
This is the complete breakdown of the LPUNEST requirement (whether it is mandatory to clear this exam or not).