You are at 1 step from the needed solution:
– Revoke capabilities you gave directly to colegioinfantil user.
– Grant him the same capabilities via role at that site. You may create a new role as a copy of the subscriber role and add edit posts capabilities set to it.
– After that open “Admin menu” for that role: you will see all available menu items from yesterday screenshot and may select unneeded menu items to block them.
