@Matthew524 did you keep retaking games until you got all answers right timed? or did you just do all the games and watched the JY videos without actually redoing the games u got wrong?
Have you completed all of the other PTs from 36-78? If not, focus on those. If you have, I would recommend retaking tests that you didn't score all that well on. BR them like you would any other PT.
Yes, it is very much doable, and I would recommend retaking tests to really learn from your mistakes/lucky answers. Don't make that the focus of your prep or anything, but definitely mix them in if you are not already doing so.
Yeah, I've found retaking RC sections to be really valuable. On retakes, I always felt like I was looking behind the curtain and exposing exactly what the test makers were really up to. Great excercise.