Hi, if you want to create an educational site with WordPress you can take a look at this site: https://fullsiteediting.com/
It is a clear, complete guide aimed at beginners but also those who already know WordPress. You will surely have fun. You will be able to take care of every aspect of your site and then maybe add mathematical games via plugins or if you have games on single pages (example: game.html) you can display those pages in an html block. The only limit is your imagination. Good work.
