Hello Aspirant

Yes, 75% is a decent score in class 12 and you are eligible for every exam you want to appear for as most of exams just have a minimum eligibility of 50% or maximum 60% in class 12 and graduation too.

Try to score above 70% in your graduation too as it'll improve your overall profile.

You are eligible for every government services exams, entrance exams related to your field.

Hope this information is helpful for you.

All the best