WHY do I always get the 4/5 stars right but never the 2/3 stars

I don't think this works for every weakening question but for ones like this, this is how I solved it correctly the first time around:

I took the "therefore" and plugged in the answer choices until I decided on E because it made the most sense logically that gave an alternative explanation.

If you plug in A, B, C, or D, after "therefore", they either don't make sense or don't offer an alternative explanation. Like I said, I wouldn't do this for every weakening question but it works for one that is set up like this :) hopefully this helped someone!

ughh I was doing great on all the other lessons and was getting everything right but for some reason I just cannot understand these lessons. Does anyone have a better solving process/way to simplify than the videos do for MBT?

I am doing great on all of the questions and I have gotten each one correct so far, but I'm off of the target time by 15-30 seconds each time. Does anyone have tips on how to get faster? The first time I took the LSAT this was my biggest struggle.