I thought I'm the only one having difficulties seeing old problems set. Past Solutions
I propose that the Brilliant Layout should add a side bar on the left side (like YouTube) with tabs:
Current Problem Sets (default)
Past Questions Viewed (like the Watch History in YouTube)
To solve list (this is especially useful when you've seen a problem not in your current problem set, and you believed you can solve it)
Bookmark (Questions, or even discussion topic)
(Any amount of tabs of your own, like a playlist)
Some details about the subfolders of the "Past Questions Viewed":
One) After clicking on "Past Questions Viewed", you will be have boxes to tick from: "Algebra", "Number Theory", "Combinatoric", "Mechanics, Electricity and Magnetism", "Data Structures and Algorithms", "Probabilty", "Geometry", "Practice Problems", "Others"
Two) And on the far right, you can tick/untick these: "solved", "not yet attempted", "failed to solve after at least one try"
Three) There's also a search box for you to look for keywords (like "Matrix", "Limit", "Pairs", "Fibonacci")
Four) The questions/problems will be then displayed, and whenever you're at the end of the page, it will load somemore (like the end of the Facebook News Feed). The problems are displayed from latest to oldest (or vice versa), and at the top of each problem, it will display when it was first viewed.
Five) Alternatively, we have the choice of selecting the week of the problem set is released as they are displayed in a form of a calendar. This is better than the our initial viewing of previous problem sets, because we don't have to keep clicking "Load previous week".
This is my current input to navigate through previous problem sets.
On the other hand, I also have a few other suggestions/questions.
I) Speaking for the majority of people, most of us use Google Chrome on Windows, so when we're viewing the solution, we sometimes have to scroll the bar from left to right which can sometimes be a little bit annoying, especially when the equations/diagram/table is too wide. So I suggest the width to be increased by about 30 to 60 percent.
II) When I solve a problem which is not in my current problem sets, why it is not displayed in my Activity?
III) Sometimes people solved the problem but they gave an incorrect solution (I'm guilty of such action for one too many times), the moderators/BrilliantStaff should be able to mark them as incorrect and separate it from the solution tab and moved it to a separate tab (called the "Incorrect Solutions") so that the users can discuss where went wrong.
IV) On the far top right of every problem. it says that it is solved by X users. But it only display the latest 3 users. Shouldn't we display all of them? Like from first to last, or in order of name, or shortest time taken for users to solve, etc?
V) I've recently exchanged points for the Brilliant T-Shirt. And it says that I have claimed on "that date". Does it mean I can't claim it again should I have another 50000 points? This question also applies to the lanyard and the ebooks (not that it is needed). And why?
VI) When I vote up a particular solution, it says that I voted up a solution, but it didn't show WHO I voted up for.
VII) I don't know whether this has been suggested before but I'm bringing it up anyway. We should be able to buy hints (like 80 points each) for some (or maybe all) problem sets. For example: "Fibonacci", "Determinant", "Sine Rule".
VIII) When we view some user's profile, we should have a tab called submitted problems on the side (below "Activity" and "About") that displays the problems the user have posed/shared (which has been approved by the Brilliant Staff of course).