Direct link to Partner Content

Hello Bruno,
First off sorry to see you haven't gotten a response I will have to check with the team for a response. In the meantime you will see that this Zendesk article shows a full menu of Khan Academy's partner content I hope this may help.
https://khanacademy.zendesk.com/hc/en-us/articles/225654568-Where-are-Partner-Content-and-Teacher-Coach-Resources-currently-located-

Should you have any other questions I will be happy to answer them for you.

To my knowledge, you can access some of the content in the respective course subject pages. Under science and engineering, some partners are listed at the bottom with links to their content. However, I don't believe there is a quick way to access the content, which I agree is especially important for those who are not familiar with the website (and may never see the partner content unless shown by someone else).

I'll see what I can do about making the partner content easily accessible, as there have been more requests about this matter.