Bulgaria

12 problems here, rated 4.6 to 7.2 on our scale (AIME to National olympiad, round 2). 12 of them ask for a proof.

Algebra 2Combinatorics 4Geometry 4Number theory 2

#	Topic	Diff	Type	Year
1	Algebra	4.6	proof	—	open
2	Algebra	4.7	proof	—	open
3	Geometry	4.9	proof	—	open
4	Number theory	5.0	proof	—	open
5	Combinatorics	5.2	proof	—	open
6	Combinatorics	6.0	proof	—	open
7	Geometry	6.0	proof	—	open
8	Combinatorics	6.1	proof	—	open
9	Geometry	6.1	proof	—	open
10	Geometry	6.3	proof	—	open
11	Number theory	6.5	proof	—	open
12	Combinatorics	7.2	proof	—	open

These are sorted by difficulty within the competition, but they aren't a course. The track is the route through, drawn from all the sources at once.