Dear shambhu!

In order to get admission for your son in BTech electrical engineering and in order to know whether the seats are vacant or not you must check the specific private engineering College website directly.

If you seek admission in goverment colleges or IITs, NITs, then your son will have to give JEE mains and JEE advanced and then participate in JOSAA counselling and then further you can know whether seats are vacant or not.

Thankyou!