Universities are afraid of failing classes. Is it useful to send text messages to teachers?

Sending text messages is basically useless, because sincerity is not enough; If it's a phone call, it may be useful, at least the teacher will be looser when correcting the paper. If your paper score can reach about 55 points, the teacher will loosen the paper and change it, maybe it will pass; However, if your paper only scored 40 or 50 points, no matter how loose it is, it will not pass the teacher's revision.