Hi, Will you tell us which state yyou belong to? There will be a lateral entry admission process so we can give better information. Other than that, you can appear for MU OET of Maniapl University, SRMJEEE for lateral entry. You can also appear for JEE Main and then JEE Advanced which takes diploma students at IITs but in the first year. all the others take in the 2nd year. 

Hai

After completing your diploma course, 
You can appear for exams like JEE and LEET.

some state universities get admission directly second year in Engineering based on your diploma course percentage.

Lateral Entry Entrance Test(LEET) to take admission in second year of engineering on other engineering colleges. This is state level examination. If you can clear this examination then through counseling you will be able to choose college from your state to take admission in second year.


In JEE exam , you can't get direct second year admission in Engineering. JEE exam is little bit tough .
If you are interested , you can.

Hope it's useful for you

Good luck!