Addendum needed?

Hello all,

I have taken the LSAT 4 times (158 160 163 (flex) 167(flex) upward trend) would an addendum be necessary? I do not have much to say about the score increase, other than I studied and improved my nerves and comfort with the exam.

Additionally, do I need a GPA addendum? I only have a 3.19 which is below the 25th for most of the schools I will be applying to.

Appreciate any insight.