Full test once a week for 8 weeks means you took 8 tests. That is not anywhere near enough preparation. Back when I took the LSAT, I was working 50 hours a week and studying at least 4 hours a day during the week and 7-10 hours a day on weekends. At the time, there were around 40 practice tests available and I did all of them (and went through my answers one by one, plus re-did some of the test when I ran out of practice tests) plus I worked through the Powerscore books. My score wasn't great, but it was good enough for a local state school to start with. Until you've really put in the time, you can't say you've done your best. If I could've afforded a good live course like Testmasters or Powerscore I would've done it and probably scored higher too. There is no reason you can't study and take the test over.
Honestly, if you think 1.5 hours a day is enough time to study for the LSAT, you are going to be in for a rude awakening in law school.
I really did put in time for the LSAT. Probably about 1.5 hours a day, took a full test once a week. Did this for about 2 months.
The school I'll be attending fails out the bottom 15%