You don't say anything about what level you are or what your health number is. Krok is pretty easy if you're prepared. You need a good wand that has sparklers attached instead of other spell cards. If you haven't already, you need to upgrade your clothes, neckpiece, anthame and ring so that your numbers are as high as possible. What school are you? Do you have training points left? I'm only asking these questions in order to give you more specific advice.