I have scored 8.27 CGPA in 1st year 7.54 CGPA in 2nd year 9.25 CGPA in 3rd year And my grand CGPA is 8.311
You can get an idea of what your total marks might be. Multiply your CGPA by 9.5 and this gives you the percentage you obtained. However, this is not your exact percentage. For eg, someone with 10 CGPA will have 95%. It does not mean he has obtained 95%, it means he has obtained between 95 and 100%. After getting your percentage, Multiply it with number of subjects you have and it gives you the marks you have obtained. Note that this is not the exact marks you have obtained but just an estimate. Best of Luck.