If you forge them at least make a realistic forgery.

I once heard about a woman who went to law school and failed her administrative law exam because she sucked at administrative law. She then decided to forge her transcripts and while she were at it she thought she might as well give herself top grades in administrative law. That fake grade landed her a job at the prestigious law firm the state uses for its lawyering needs. They soon started to wonder why their new employee sucked so badly as administrative law, despite having top grades. They checked with the law school and she were found out.

The moral of the story is that you should make believable forgeries. Had she given herself average grades she would still have been a lawyer.