I believe that the Practise section of Brilliant should be modified. Here are just a few "problems"
1) Solutions cost points + Problems can result in point gain: Note that the practise section is not supposed to be for gaining/losing points, but simply for practise.
2) Problem "styles" do not vary: Problems of a particular section are of the same style; there are 3-4 styles per section. I believe that a greater variety of problems should be added.
3) No "problem solving" problems are present: Problems such as brilliant's challenges should be added to the practise section, possibly under the section "Olympiad". This would be good practise for anyone who does not want to practise algebra.
4) The practise section offers solely algebra: More topics, such as geometry, number theory, and combinatorics, should be added.
Feel free to argue against/for any of these ideas, or add your own ideas to improve Brilliant's practise section.
I hope that Brilliant will take this, and any other requests, into consideration.