To build up/to enlarge/to enrich your vocabulary
To be good at smth
Cause a problem
Take notes
Fail an exam
Get a bad mark
To have a memory like a sieve
Take an exam
Solve the problem
To be a major
No pain, no gain
Get a good mark
Pass an exam
To keep up with smb
To teach
Lend some money
A Law student
To Learn
To have a memory for smth
Borrow some money