Hey Souvik Dey. 

Marks can be calculated from percentages but not from percentiles. Percentage is your marks calculated out of 100. Percentile is the percentage of students whose marks in that particular criteria are lesser than yours. So, if your percentile is 71. It means that 71 percentage of the total attempted students have their total marks lesser than yours. The same applies for individual subjects too. You can't calculate your marks from the percentile you obtained. Because marks are absolute and percentile is relative. You might know your marks if they release the performance statistics. Otherwise,  you can't calculate. Hope this answer has helped you.