Nowhere on the internet. I think you will get the best information by sending a mail to firstname.lastname@example.org.
You can make use of the intermediate level learning paths on the academy. They have sample questions at the end of each of their modules.
And as far as I know, academy team does not provide further sample questions besides those.
I took the intermediate exam quite recently and my advise for you would be to work on all those learning paths and to go over all of them before the exam.