I had 6 subjects in 12th.Passed in 5 subjects with 65% and have 52%in pcb.But failed in maths.Am I eligible for neet?

Dear Jabin, as already discussed, the criteria for NEET is that you should have COMPLETED and PASSED your 10+2 with a minimum required aggregate based on the Category that you belong to. Though your aggregate is good, you cant appear for NEET because you haven't cleared Mathematics. Now Mathematics might not be necessary for appearing in NEET but it is important to clear the exam to be considered Passed 10+2. Even if you have scored above the required aggregate  because you haven't passed 10+2 as whole, you cannot appear for NEET.