... because it was a hard preptest that the actual score ... you would receive on test day would be higher ... line with your other test scores you've been ... score based on how the test is scaled.
I do a preptest every 2-3 days after work, and find I get the same score (or better) than in the AM on the weekends. As long as it's not a drastically different or skewed mark I'm sure it's fine!