greetings shyam,

yes, diploma course in biotechnology can be done. the course and syllabus will include subjects like biological chemistry, biophysical chemistry, cell bilogy and genetics, bio-statistics, molecular biology, toxicology tc

following are a few colleges:

acharya polytechnic, bangalore

https://www.careers360.com/colleges/acharya-polytechnic-bangalore

guru nanak dev university, amritsar

https://www.careers360.com/university/guru-nanak-dev-university-amritsar

techno india university, kolkata

hope this helps.

good luck.