Hii

If you havent done B.Tech but still wish to pursue M.Tech in biochemical engineering. I would suggest that you first complete your MSc degree. There are many universities which have Eligibility for MTech as follow-
Candidate must have a B.Tech degree with 50% aggregate score.
Or
The candidate must have completed BSc. and MSc with 55% aggregate.

So if you would complete MSc, there might be chance that you would do MTech later.

Hope this helps
Thanks!