Hello Srilakshmi,
It is good that you have completed a Bachelors degree in MLT. However, to qualify for writing the pre-medical entrance examination, you should have a 10+2 completion (last two years) with Physics, Chemistry and Biology/ Biotechnology as science subject and English.
I fear you have to go for PUC with biology stream.

Since you already have cleared PUC with Physics and Chemistry, there must be options to write only Biology examination, but you need to get that information from your institute or university directly.

All the best,
Suresh