India

Hello, competition is immense however agriculture is a very demanding area in Canada. A bachelor degree may help you fetch entry level jobs but being a foreigner you must have better skills and qualifications to be recognized. I will suggest you take up a PG Diploma course in agriculture or related field, work permits are applicable to international students, if you are lucky enough you can apply for a PR later.
Regards

First of all congratulations for getting such good marks. You can easily get admission in an NIT in Delhi or anywhere else.

Good day sir, i am in a fix i donno whether to take up mechanical engineering ,or to serve the nation.please do help me with this and is there scope for mech ?

Yes, your chances are quite bright. DU has started taking applications now. Check online for cut-offs and apply.
Good Luck.