No, your 12th and 10th board marks do not have an impact on placement opportunities. The most significant factor in placement is your graduation degree. Companies prioritize your programming skills over your secondary school marks. It is crucial to concentrate on the present and strive for a brighter future, as dwelling on the past will not alter anything.

Check the career choices after 12th: https://school.careers360.com/articles/career-options-after-12th

Hii ,

Hope you are doing good.

50% is not that bad. And 85 % in 12th is a very good percentage. And if you have pursued your CS from a well recognised University with good accreditation and if you have a good CGPA in your graduation degree. And ofcourse your college university and it's affiliation & accreditation is what matters. So, if your CV has all this details you'll be getting a good placement, no matter what is your 10th % although 50% is pass. So don't worry. And if you are placed from a campus than well and good.

Hopefully I'm clear to you.

Best wishes for future endeavours.