Thank you very much Erdinc, these are really good suggestions that you gave, I didn't think about them this way before. It is irritating when you don't remember something you know you studied before, but reading texts from different sources will raise new questions and give a refreshment of the material from different perspectives.
Yes, movies won't work, as well as newspapers or books won't work for my level.
I'm going to look into "Colloquial Turkish", but I think I should buy it after I finish my language course in Istanbul, maybe after a month there I will need a higher level... hopefully .
Thanks a lot Erdinc, I appreciate your great advice.