The callback you have given in add_menu_page() is a static function, not a class method. It should be:
add_menu_page(
'School Manager Settings',
'School Manager',
'administrator',
'school-manager-settings',
array ( $this, 'show_admin_settings_page' )
);
And please don’t use &$this anymore, that’s PHP 4. 🙂
My demo plugin T5 Admin Menu Demo might help understanding how that works.
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