Hello Aspirant,

The eligibility criteria for NEET is that a candidates must have passed 10+2 or equivalent with Physics, Chemistry, Biology/Biotechnology and English as core subjects from a recognized board with minimum 50% aggregate. IIf as you have mentioned your scores included practicals marks too, then you have  secured an aggregate of 52% in 12th. So yes, you are eligible to appear for NEET. And NIOS is a recognized board so ,no colleges are not going to reject your marksheets. See to it that your theory+practicals PCB along with TMA score percentage is above 50. In NIOS TMA is added to the total marks and is given 20% of weightage .

https://medicine.careers360.com/articles/neet-eligibility-criteria

All the best