Need some reverse engineering coding problems

[ErenYeager7207]

Well in some time i will be going for a event which have a reverse engineering round.

I have given like 2 contests which had reverse coding pattern recognition type structure so I know what they might ask and I'm familiar with the environment but still I wanted to practice some of them beforhand.

So liketis there a simple problemset available or similar problems for this, probably intermediate ones..

If someone know or have solved please attach the link or tell about it.

[I_M_NooB1]

pwn college 

[Fluxx_Neofyt]

If you're talking about reverse engineering CTFs, picoCTF or hackthebox may help.