Exclude Woo Commerce Category from specific User

Hi,

Does anyone know how to exclude a product category in the woo-commerce plugin from a user-role.

Basically I have an art supplies site which I want to exclude certain products from ‘Schools Only’ users.

I have set up the roles but can’t seam to exclude categories for sepcific users.

I tried using this plugin, which brought a whole host of problems along with it.
http://ignitewoo.com/woocommerce-extensions-plugins/woocommerce-restricted-category-access/

Thanks for any help