hey guys im trying to update my database using php ang ajax, but assuming that the textbox are dynamic thats why im trying to update the database using multiple updates with one
It appears you have no space between SET and grade.
SET
grade
Adding a space here should do the trick:
$update_grades_boys = "UPDATE registrar_grade_archive SET ";
If this doesn't do it, it would help tremendously if you could post the result of echo $ready_edit_grades_boy; and update your question.
echo $ready_edit_grades_boy;