My grades are not understandable

I am from India, my grades are not in GPA, and I can't make it understand the colleges; I cannot understand how I can fill these grades in the common app application. Should I calculate them in GPA? If not, my grades were 3.5 in 9th, 3.65 in 10th, 3.9 in 11th, and I am currently in 12th. Should I calculate all over average, or do I need to state current-year grade means? I need to state 11th class grades as my primary GPA, I have predicted scores too, and they are also 3.9. Will they reject me based on my 9th and 10th scores? My 10th was affected due to corona; I live in a remote area, where taking online classes was a problem.