How to calculate backlocks??

[darshan96411]

i had backs like below
1st sem-2 backs-cleard with 2 attempts
2nd sem-2 backs-cleard with 1 attempt
3rd sem -5 backs-cleard with 1 attempt
4th sem-2 backs-cleard with 1 attempts
BE complete with 7.5 CGPA
how many backs count for canada???
anyone tell me...plzz