I will now complete 12th but I can't fill any entrance exam form college and can't waste my one year. What can I do?

There are still many colleges whose forms are not out yet. Most probably, some colleges release their forms in the month of April. Keep yourself updated with the private colleges of your choice. And, if you are ready to pay extra amount, then you can go through management quota in private colleges.

You still have time to fill the some of the top private college of engineering. Or, you can take admission directly in many colleges through the management. It is good that you don't want to waste your time.