2:52 PM, Tuesday May 18th 2021
We don't force students to start over unless they are noticeably struggling with concepts from way back in the course. A gap of five or six months is pretty considerable though, so I would recommend reviewing the material from the earlier lessons and getting back into the swing of doing those exercises as warmups (not from memory - make sure you're up-to-date on what the exercises actually ask of you, since it's easy to forget), then you can jump back in where you left off.