What are the points for?
Experience Points, or XP for short help you reach new levels. Also, you can use them to compete with other using the Leaderboard on the Home tab. You can find the leaderboard under that tab if you scroll down and look along the right side of the page. To compete with someone, go to their profile and click the green "Follow" button. :)
It has been a very long time since I received less than 10 points per practice session. Are they still awarding less points for reviews? For a while, I could struggle through 65 questions, and only get 5 points for the effort if it was review or strengthen.