Please explain me the difference between biotechnology and bioengineering in short and scope of both of them. Please state the best colleges of both of them.Also explain how to apply for it after 12 board exams.

Biotechnologyrefers to manipulating biological processes to create desired products in an efficient high throughput manner. Or it can refer to genetically modifying organisms to introduce desirable properties such as crops that dont need pesticides. Biotech has made advances in food quality/quantity and chemical manufacturing.
Bioengineeringoverlaps with Biotechnology in many aspects but also expands to medical applications, genetic engineering, cell engineering, biomimetics, and bioprinting.
Here is a list of top colleges providingBiotechnology courses after 12thin India:

Indian Institute of Technology, [IIT] Kharagpur

Indian Institute of Technology, [IIT] New Delhi

Rajasthan Institute of Engineering and Technology, [RIET] Jaipur

Indian Institute of Technology, [IIT] Chennai

Indian Institute of Technology, [IIT] Roorkee

Indian Institute of Technology, [IIT] Kanpur

Birla Institute of Technology and Science, [BITS] Pilani

Indian Institute of Technology, [IIT] Guwahati

Institute of Chemical Technology, [ICT] Mumbai

National Institute of Technology, [NIT] Surathkal

PSG College of Technology, [PSGCT] Coimbatore

Delhi Technological University, [DTU] New Delhi

National Institute of Technology, [NIT] Warangal

Netaji Subhas Institute of Technology, [NSIT] New Delhi

Birla Institute of Technology and Science, [BITS ] South Goa
Hope that helps thank-you.