Hey.
Look there are very few people who clear NEET in first attempt and really appreciate them.
So its very normal to repeat and have a drop.
Eligibility criteria doesn't excludes you.
You are eligible. But you have to submit a certificate regarding the same.
If you want I can share its format of the same.
But for now you are eligible if your PCB score in 12 is 50% and above.
Regards

Tq