Education Wrong results?

Got the remark and photocopy. The grades were correct but at least now I can see that out of the 13 raw marks I lost about 8 of them were careless mistakes like forgetting the minus sign and multiplying 2 numbers instead of adding etc.
On the positive side, I should have no problem getting a good grade by repeating. On the other hand however it really sucks to think I lost out on a really good grade to something this stupid

 

Bad luck