What is the ruling on using take-home exam reviews in studying Sharia sciences online, and are the certificate and money earned through it unlawful, and what should I do to repent, and should I inform the officials of what I have done, and should I stop studying?

Weakness in faith does not affect sincerity and good intention, but one must strive to keep steadfast and continue on the path, and not obey Satan who discourages. Using study notes in an exam is considered cheating according to the exam rules, and regretting it is repentance from it. It does not affect one's studies, certificate, or work if performed as required.