About GPA and Class Position
Some univs encourage converting % to GPA, while some ask to simply report the scores.
In a way, my 63% in B.Engg from Mumbai univ would seem too low against univs from south India where toppers easily score 85% to 90%(contrary to 75% in Mumbai Univ).
Please tell me a solution.
Most of the better Univs. have their own department which converts the marks percentage to GPA according to the norms set by them. For each country they have their own parameters and many good Univs are aware of the anomaly mentioned by you.
Now a solution to your problem. Please find out your position in class or university and get it verified by some authority. You should attach this along with your application. Also a mention of this should be made in your SOP.
I had a few students from Maharashtra and we successfully adopted this strategy.