For LG you can download the youtube videos. This can either be done with YouTube Premium (currently ~$17 a month, but there may be a free trial too) or using some third party software.
I was in the hospital the day before the LSAT and I got a nose bleed during the test, I scored in the 140s a 17-20 difference from my PTs. Yes, you are not alone. I too feel pretty miserable.