I want a resource or recommendations for where I can get difficult Mathematical problems.
This problems must be really difficult and require extremely substantial intellectual prowess to solve.
I would also love a way for me to verify my answers of course, I would prefer if workings are shown with the answer result.
Catch though: The problems must not use more than High School Mathematics (once again -Calculus).
Uhmmm In my country in High School there was a Basic Maths curriculum, and an extended Maths curriculum. Calculus, Algebra, and Cambridge A level Pure Mathematics were part of the extended curriculum.
The rest was part of the Basic curriculum.
I would like for the questions I attempt to only require basic curriculum knowledge. (For certain reasons, I never really learned Calculus until now; only learned Integration on Tuesday, and could get by with Differentiation.
Limits, Fundamental theorem of Calculus, etc I all plan on internalising soon).
So difficult problems, that only require Basic High School Mathematics.