It is possible to change engineering college in second year of B. TECH ?
Your college will lose all those fees that is expected from you in your 4 year studies. So they may/may not ask for compensation. Again you should have a valid reason to get it approved from university such as change of house, family moving to new place. Please contact your HOD for this matter, he will lead you to the relevant person. It is not normally appreciated, however you try your luck
Yes, you can change college in the same university. Go through the university norms. You will need a certain SGPA in 1st 2 semisters.