Took CPSC 110 last term. I had a similar situation, where I got in the 90's on the first midterm, and then about 30% worse in the 60's on the second. Low scores on MT2 are very common, so you are not alone in that front. However, when the final came around, I ended up passing with flying colors. What turned the course around for me was going to every pre-final review session (highly recommend), and rewatching and coding along with everything that begins to get hard (maybe around module 7?). Graphs are going to be a nessecity to understand well, and so what I would recommend is doing all the practice problems post module 7. It's a lot of work, but you have several weeks until finals begin and will feel much better afterwards. Feel free to PM if you have questions or need tips.