Hello student nothing to worry about computer subject is not mandatory in class 12 for engineering you can pursue computer science engineering even if you've not computer subject in class 12.

If you want to take admission in top engineering colleges like NIT's IIITs CFTIs and other good engineering college then you need to appear in jee main entrance examination.

Eligibility - candidates must passed or appearing class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board.

Feel free to comment if you have any doubt

Good luck