[fixed] custom starts automatically having 100 in all school grades

locations/intro_sg_select_custom.qsrc

@@ -24,14 +24,8 @@ if $ARGS[0] = 'start':
 			gs 'obj_din', 'old'
 		end
 
-		killvar 'class_list_institution'
-		killvar 'class_list_name'
 
-		!!Setting the shcoll classes such that grades can be assigned
-		gs 'intro_functions', 'create_sgclasses'
-
-		!!Set the greades to be average.
-		gs 'intro_functions', 'set_base_sgrades'
+		gs 'intro_functions', 'reset_sgclasses'
 
 		gt $loc, $loc_arg
 	end