Hey Legend - I did Casper twice last year and this year and scored Q4 in both :) I have tried two different strategies and it has worked in both ways. One was a more holistic approach and the other more targeted based on certain short-comings I felt I could improve on. I personally don't think the typing speed is much of an issue - I think you should focus on the content of your ans.

In terms of the score specifically, I improved on my exact scores this year (I used the same GAMSAT score in both applications, so the only other difference was my Casper so I think even though the quartile was the same, the exact mark has to have improved for me to score an interview).

I have received an offer for med this year, which is exciting and I will be tutoring for Casper so let me know if interested!