What if want to take admission in a B.tech college directly after 12th on management seat so which colleges would be better,best and cheap?

You wont get a cheap seat in management quota, if u have the guts u can get seat in good college for 20lac. otherwise u can go for any roadside college they wont ask for ur marks and u will do ur btech cheaply

I particularly not encourage you for admissions under Management quota, rather go for merit list based allotment of seats.