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I took the LSAT three times and scored 152, 164 and 166. Should I attach an addendum to my application trying to explain the bad score?

Don't bother - assuming that was the order of your scores, the schools will just assume that you prepared more and that your scores went up as a result. They really only care about the top score anyway.

OK thanks.

I wouldn't do it either. LSAT addendums should be rarely used.