Hey, Thank you for contacting us. To convert CGPA into marks you just have to multiply your CGPA with 9.5. You will get your percentage. Then from the percentage, you can easily calculate your total marks. 

for eg: Your CGPA is 9

So your percentage will be 9*9.5= 85.5

But You should go and ask for the provisional certificate from your school. That will give you accurate marks without any calculation and all the mess. I hope this helped.

Best Wishes.