10
Nice site, a few remarks:
Speed is just fine.
There are a lot of blocks to navigate,
keeping it simple would increase visitors apriciation.
Maybe
multimenu is a good solution?
I find it confusing that pdf books have there own section, whyle the are actualy downloads, why do they have a seperate module?
It is strange that a page about statistics is almost on the top of the menu, the average visitor does not come to your site for that.
My advise is to place the most wanted aspects of your site on the top of you menu.