The best remedy for a student's problems related to learning is

The best remedy for a student's learning problems is diagnostic teaching, which first identifies the exact difficulty.

It pinpoints where and why a learner falters and then targets instruction to that specific gap.

Merely suggesting hard work assumes effort is missing and ignores the real source of the problem.

Supervised study in the library gives a setting but not a diagnosis of the learning difficulty.

Suggesting private tuition shifts the task outside without locating the underlying cause.

Diagnostic teaching naturally leads into remedial teaching, which corrects the weaknesses it uncovers.