hey,

if you want to take admission in nanotechnology at the under graduate level then you need to clear the intermediate examination in science stream subjects included are physics, chemistry , biology/mathematics , however no institution in india offers bachelor courses in nanotechnology , candidate holding B.tech degree in material science, mechanical , biomedical, chemical , biotechnology, electronics and computer science or B.S.c in physics, chemistry , mathematics and life sciences can also apply for the postgraduate cousres in nantechnology

as you want to be a nanotechnology engineer and you are finding diificult to go outside from country then i would suggest you to pursue B.tech in any of the branch mentioned above and then go for M.tech in nanotechnology.

here i am listing some colleges offering M.tech in same

1. SRM university, tamil nadu

2. jawaharalal nehru technological university, hyderabad

3. punjab university, chandigarh

4. amity institute of nanotechnology (ANIT), noida uttar pradesh

5. amrita centres for nanosciences , kerala

good luck!