in a moment like this you can help the person

By letting the others know that this is not right and giving everyone a task to complete.

If you have a group work to do you should try and have neat handwriting, you can atleast help them write the project or you can just get a neat handwritingworkbook so you can practice your handwriting

I would take on the task of writing with that person.

I would ask my teacher if we could go in pairs and the student also we both would work

Help them with it or tell them about and they will finish it together