from this i can see 3 things happening.
1) he will tell her about the deal with the teach and she will be devastated that they will see less of each other everyday and begin to study hard so she can be with him.
2) after finding out about the deal, she will make deal again that will put her on a supplementary test and she must pass it.
3) she/they will notice that there is a miscalculation on her test paper making her rank up.