B.Tech and B.E Admission process for the academic session 2020-21 will begin in the month of March or April.
Almost, all the states initiate the entrance exam process for UG B.Tech and B.E admission in March/ April.
B.Tech admission process in IITs, NITs, and IIITs is different from UG engineering admission process in private engineering colleges.
As you have not mentioned the name of university you want to get admitted in, you can check the further information on the official site of the particular university you want to get admitted in.
Hope it helps :)