Need lots of help!

Is it even possible to obtain 3 stars on every level? I've been replaying levels for many days now and can't get it.

2 star levels: 9, 20,23, 27, 33 & 38, 39, & 40.
1 star levels: 24 & 29.

Please look here:
https://www.youtube.com... I can't do level 24 with 3 stars, but I will try it again, maybe I will beat it!

You have to search at YouTube for "Die Legende der Elfen", because it's the german version. But the levels are the same. Good luck!