Hello

There are many eligibility criterias set by AEEE, but the major one is that only those students will be eligible for admission in Amrita University who have qualified JEE mains and should have passed 12th boards. Thus this makes you eligible for Amrita University.

https://www.google.com/amp/s/engineering.careers360.com/articles/aeee-eligibility-criteria/amp

But for admission in NIT ,you must get atleast 65 percent in your 12th boards and should qualify JEE mains. As you have not cleared the percentage barrier thus you will not be eligible for admission in NIT.