Yes, the hostel facilities are good. Also, these days, ragging is rather less everywhere. Ragging is a serious crime and there are enough protections by law for it. Even if you face ragging, do not collapse. Do not commit yourself to do anything silly. Simply, inform your guardians and seniors and ask them to lodge a complain with the police (FIR). Police will take immediate steps and inform the authorities to expel the mischievous students, so there is no concern for you at all and no need to change your study plans in fear of ragging. The more you fear the them, the more will they harass you.
Jadavpur University, as you probably know, is a premier institution to study civil engineering. You got a chance to study there means you are lucky, and brilliant. You are the one who got selected by your own merits, outwitting thousand others who yearned for a chance but in vain. Go for it. In case of any ragging, inform the authorities and the police at once.