The best evaluation you can get is a step above that, "a good spar".
* round 1: either Provoke or Guard
* round 2: Guard, then Strike if you focused on kickboxing or Grapple if Ian is under Wen's tutelage. For grappling, to score a point you'll need to put extra effort in the gym; possibly for Strike as well, haven't tested that route.
* round 3: doesn't really matter. Tapping out will let you avoid getting punched in the face, if it bothers you to get one. But keep in mind that will cost you some athetics/friendship gains, if you did well until that point.
edit: actually, wait. The way things are coded currently, it is not possible to get more than 3 points in jiujitsu even with extra effort, and the game requires 4 points to perform good in the spar. I'd presume this is an error that the developer might want to hear about, since it doesn't seem to be intentional.
This is the problematic bit, in chapter 8:
Python:
if v7_effort_gym:
if jiujitsu < 3:
$ jiujitsu += 1
It should be
< 4
in order to work, or simply do away with the check altogether.
Alternatively, the skill requirement in the spar should be lowered by 1 point for jiujitsu branch. But then you could get the best result even without extra effort (and the extra effort potentially produces no benefit as your skill can already be 3 at that point) which i doubt is the intention.