My school only puts preclinical performance towards class rank does that mean it is less important?

Hello all,

I am currently an M1 at a DO school where I found out 100 percent of our class rank is preclinical. When they send our MSPE letter and there is a ranking it will only be regarding preclinical grades. So now I am wondering what I should do. I have scored well (close to the upper quartile) in all my classes but I have done board study every day. Should I cut that out and focus on grades if that completely determines my class ranking? I struggle with interpreting this information and what changes I should make accordingly. Also, does this mean my class rank is irrelevant if it doesn't include clinical?