use a basic form of previous logo (logo design # 1 through # 4). in the middle of the logo element illustrations are added a sun and that are open book (I think) was quite representative of all the definition of your company :)
Your feedback will help me understand the logo design like you want and will help better logo later
logo uses the concept of natural, using the tip of a ball tip circle, which defines education and some books that are in the middle circle is symbolically represents your company identity
I hope you are pleased