Hello @nuha,
You can definitely create the drop down menu in education hub theme .
For creating the drop down you simply need to create the menu by going to Admin Panel > Appearance > Menus . Here you can add your required menu item . Now finally create the dropdown by dragging the menu under the parent menu and save .
For clear info please refer to below screen shot :
https://image.prntscr.com/image/YOsgv3fWTNGy7XsGktplDw.png
Hope this helps .
Best Regards!!
Have a good day .