Has anyone done the practice test from Acer? I did it two days ago and scored 55 out of 75

on section 1 and 60 out of 110

on section 3 did section 2 but found this really hard in the time given as not used to writing by hand , also noticed not having spell check!!! a friend who did English lit marked it according to the acer pointers and gave me 50 %.
I checked on the Acer website to see how to convert my scores into a gamsat score but it dosnt really tell you how they do it other than that the scores are not percentage scores! Therefore is the practice test a bit of a waste of 5.5 hours!! I know that 55 out of 75 seems pretty good (73 % as an absolute %) and 60 out of 110 (54%)pretty bad and that 4 weeks studying organic chemistry got me nowhere near to the level required on the test but other than that not much further forward really.
Also there seems to be two ways of giving a score one when the section 111 is double weighted and one were all three are equal does anyone know which they use in the UK? as equal scores would be beneficail in my case.