As per the eligibility to apply for NEET entrance exam you should have passed class 12th with minimum 50% PCB Aggregate score as a general category & 40% as a reserved category.

The age limit: As a general category you should not be more than 25 years & 30 years as a reserved category.

You can check the further eligibility with the given below link.

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

Good Luck!