Although learning spelling or orthography  in any language isn't any fun, I found a way to make it fun - by creating "Whack a mole" exercise, or "udari krticu" :) 

How to Practice Orthography in Serbian

While the idea of this game is to hit a mole bearing the wrong answer, I noticed while learning German that this principle enforced the wrong answer in my  mind. Therefore, for my students of Serbian, I created this game based on "hitting the right mole", which will draw your attention to the correct spelling. Once you figure one which ones are the correct ones, jot them down!