Trouble taking practice tests seriously!

Hi! I don't know if anyone else has been experiencing this, but I am taking the September LSAT and just cannot seem to lock in. When I take a practice test or a practice section, I find myself being really lazy when I go through it. Like, I know what diagramming I need to do, or what steps I need to take to figure out the situation, but I just do not take them. I'm not sure if I'm just being lazy or if I feel so crunched for time that I feel like I cannot do it. For reference, I just did a LR section and went -8 the first time and blind reviewed -0.

I try to do the first 15 in 15 minutes and then go from there. Any tips would be appreciated!