my rank is 2625, can any one help me out for selection manufacturing engineering in iit kgp or engineering design in iit m?

First thing is what is your interest field. Do yo want to persue career in core or non-core field.

Though choice may change during degree as it happens to many students.

some go for higher education if they want to persue in core that too with higher degree like mS or PhD or join core companies

some go in software field others in financial field

so join the one which is near to interest.