Greetings, aspirant!

The eligibility criteria for appearing for the UPSC civil services examination includes a graduation level qualification. In order to get into a graduation program, a student has to complete their 12th examination with required Percentage (depending on the college they wish to join)

So to answer your question, the marks you score in your 12th grade do not affect your ability to take the examination. As long as you have a graduation degree, you can take UPSC examination.

However, don't let that keep you from working hard. If you eventually decide to opt for a different field, your 12th grade scores might come in handy.

Hope this information helped you!

Best of luck!!