[rapphil]

In the past I did this: http://eudyptula-challenge.org/

Not sure if they are accepting new applicants, but you can try. Also, you can try to find the assignments online.

[neuland]

The assignments are online in various places. Here is a copy I made from someone's Github (not linking GitHub b/c it had answers too): https://pastebin.com/cUXuHcDc