Too late to start flashcards

I wrote down nearly all my flashcards but have not studied them…is there any point in studying them out or is it too late and I should just focus on problem sets?

flashcards are for remembering, so I don’t see the harm in glancing through them from time to time, especially when there’s more than 2 months left before the exam. I sometimes update my flashcards/notes if I learn something new from a problem set/mock.

Take one day a week to review old material, lest you forget it.

Flashcards help in this regard.

How long would you say I should review once a week for?

Till a week before the exam.