Fine, but as four native speakers (three of them teachers) have said, most people do not use 'whom' except after a preposition. Even then, most of us say, for example, "Who should I give the ball to" rather than "To whom should I give the ball?"who and whom
areboth refer to people.
who refers to the subject, whereas whom refers to the object.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.