Hi guys,
Actually I am very confused and I really appreciate it if you can help me out here.

I want to have WordPress as my website ( not my blog) and also Joomla as my subdomain, my website represents an ESL center, I need WordPress to get better ranking for my educational articles and enjoy social network plugins and I need Joomla for some of the good components it has for students, such as surveys and registration components. So my website will have a separate subdomain only for Joomla.
So is it SEO friendly to have a WordPress website with Joomla in subdomain?

Do you recommend it? And if yes, should I just install them separately or do I need a plugin or something?
Thank you so much for your support!