hi vimal.

to become a software engineering I would suggest you to do b.tech course in computer science engineering. to get admission in b.tech in cse, the eligibility criteria is candidates must have studied 10+2 course from a recognized education board with physics, mathematics and chemistry or any other additional subject as a mandatory in 12th program.

popular engineering entrance test In india is jee main, viteee, bitsat, or other state engineering entrance like mhtcet, wbjee, gujcet. so from 11th standard you have to focus on numerical problems of physics, chemistry and mathematics mainly . you may solve books like tata macgraw jee main books, or arihand experts mcq books for engineering admission.

now coming to fees of colleges government colleges has less fees and coming to nits, iiits, iits has many scholarships for economically weaker section candidates.

while you want to pay less fees you must try to score high to get chances in government engineering colleges.

hope it would help.