I had done 10th from up board and my marks in maths was 51/100,in science 66/100,in hindi 82/100,in English 83/100,in social science 81/100,in art 86/100. So, I am eligible to give kvpy. and above will matter if I apply for abroad studies can it will also matter in jee exam.
You need to have atleast 75 percent aggregate marks in maths and science to be eligible for kvpy.
For abroad studies your scores are pretty mediocre and you would need to do a better performance in your 12th. Still you can get a good college. The admission mainly depends on your performance in corresponding exams (SAT, GMAT, GRE etc.). Also, colleges today also consider co-curricular activities and other various experiences.
Remember that 10th standard marks is just one of the many other things in your Profile.
And 10th class marksheets are usually used as a proof for birth and the marks won't be considered for the jee mains exam at all. But you need to have a above 75 percent aggregate marks in your 12th to be eligible for jee advanced.
Hope this helps
The eligibility criteria for KVPY course is that one should have secured a minimum of 75% (65%forSC/ST/PWD) marks in aggregate in MATHEMATICS and SCIENCE subjects (Physics/Chemistry/ Biology) in the X Standard Board Examination during the academic year 2018-19 areeligible to appearforthe Aptitude test.For JEE mains, or for studying abroad, your 10th marks has absolutely no weightage.
Your 12th board marks will be considered everywhere and you must also try to secure 75% marks in 12th board with PCM for being eligible for admission in IITs,NITs,IIITs and GFTIs.
I hope this helps.