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I was writing this one sentence and confused with prepositions. Additionally, I would like to know if there are other grammatical errors besides these two prepositions.
....They are always helpful for reminding me of what to focus on in order to improve my English.
Thank you for your help.
Looking at the Oxford Dictionary definitions for the two prepositions that you proposed:
in meaning 8 - As an integral part of (an activity)
for meaning 4 - Having (the thing mentioned) as a purpose or function
Both prepositions are correct: in would focus on their involvement in your studies, and for would focus on their purpose.
Remind me that I have to go to the dentist at 3pm.
that is a relative pronoun here, and you can substitute other relative pronouns: what, who why, which, etc. so it's OK to say
...reminding me what to focus on...
It is not necessary to add of before what in this sentence. It's not wrong to include of, but it sounds a little strange.
I wouldn't use either for or of in this sentence, but use commas instead :
They are always helpful, reminding me what to focus on, in order to improve my English.
