Yes, You are eligible to apply for NEET Entrance Exam & AIIMS. As per the eligibility you should have minimum 50% PCB Aggregate score in class 12th as General & 40% as a reserved category. The age criteria is that you should not be more than 25 years as a General category & 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

To apply for AIIMS you should have minimum 60% Physics, Chemistry, Biology and English as the main subject as General & OBC  and 50% as SC, ST. You can check the further eligibility with the given below link.

https://medicine.careers360.com/articles/aiims-mbbs-eligibility-criteria

Good Luck!