The LSAT is a "standardized" exam, meaning
it's always exactly the same test. The score curves adjust
to compensate for any changes in difficulty.
So your performance on real LSATs -- as long as they're administered
in a timed-and-proctored, group setting -- should, barring last-minute
divine or satanic intervention, indicate how you're doing,
and where your score is trending.
The Personal Performance Analyses® will let you see in clear,
full-color graphic representations whether there are any fixable
patterns of loss by Q-type or by Trap-Answer Type.