Definitely helping out others is a great way to study! By teaching, you'd not only make sure you have a solid understanding of the material, you are also practicing explaining concepts in your own words. Besides it is a very rewarding to teach and help out others

(of course be picky with who you help, only help those deserving of your aid).
As for the study score, I will say take your mind off from it. Placing too much emphasis on it gives yourself unnecessary stress and encourages an unhealthy competitive mindset where you are always trying to compare yourself with others.
Paradoxically, in order to obtain the best study score, you've got to take your mind of it; study and collaborate with others with all your heart. Remember, process over product. Only use study score when you are not studying to gauge where you stand and where to improve.