If you want to do MBBS after Nursing then you can do it by qualifying NEET, provided you need to have Physics, Chemistry and Biology as subjects in your 10+2 and you must have scored the following at least as per your category-

• UR - 50%,

• OBC/SC/ST - 40%,

• PWD - 45%

Also NEET don't have any upper age limit. So you have no problems like that.

For more information regarding NEET consider the link below:

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

I hope this helps. Wish you a great day!