Should i install multiple wordpress for one site?

Best way is to use custom post type, that will create another section in wp backend. you can do it your own if you are a programmer or you can use custom post type if you dont know how to program. custom post type plugin will create another post type for your education section and paid version of can provide the template to customise and display the post type in frontend.

Yes multisite is a bit complected approach to meet your requirement and you dont need to install multiple wordpress.

Refer this plugin for create custom post type and display on frontend