ibps rrb scale 1

hi guys....i attempted 15 of 40 ques in reasoning & secured 16 marks in d result. similarly 17/40 frm quant & got 14mrks, 31/40 frm gen awa n gat 7, 35/40 frm eng n got 17,35/40 frm comp n got 10... my ques is how do they calculate the marks which i ve attempted n wic i got?? any1 pls clear my doubt na!!!

how'scan it be possible?