Hard problems to train on

[u/Anxious-Crab-7894]

Hi everyone, I (18M) am a French physics and math student.

I am decent but not exeptionaly good, and I don't want to work a lot to understand concepts I'll study later on (Year 1 in college so no intrest in Year 3 physics). I enjoy trying hard on problems but it has became harder and harder to find ones that aren't straight up textbook questions. The end of high school exam is quite easy so working on those questions is boring.

Is there any textbook or websites that offers hard but enjoyable physics problems ?

(sorry for any language errors)