You havent mentioned if your overall 12th percentage is 45 or the aggregate in Physics, Chemistry and Biology is 45% with 58 marks in Biology. For being eligible for NEET, a candidate belonging to ST Category should have completed his 10+2 and score a minimum aggregate of 40% in Physics, Chemistry and Biology. For example, you scored good in Physics and Biology but scored pass marks in Chemistry and you reached an aggregate of 40%, you are still eligible for NEET. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. If you have acheived an aggregate of 40% in Physics, Chemistry and Biology and you score good in NEET, you can join a MBBS seat. If you are planing on taking on NEET, this might help you:

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Hello student as per neet eligibility criteria Candidates must have Physics, Chemistry, Biology/Biotechnology as their subjects inClass XII. All applicants must have obtained the necessary aggregatemarksin the qualifying exam: General Category- 50%marksin qualifying exam. OBC/SC/ST Category- 40%marksin qualifying exam.
Help me with your category so that I can provide you exact information.

Feel free to comment if you have you have any doubt
Good luck

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