Hello Hello student yes placement affects slightly by class 12th percentage but not much if you've done well in your college academics and you've relevant skills for the respective job. I request you to please help me with the college/course placement you're concerned about so that I can check and provide you with the exact information.

If you've less percentage in class 12 and you're worried about your future I'll suggest you to please don't worry as it's gone focus on your present try to score good in your academics do internships to enhance your skills so that you'll get job easily in placement.

Feel free to comment if you've any doubt

Good luck