JBDad - my DS picked up some bad habits in preK b/c the teacher's didn't correct handwriting and he taught himself. The one thing that worked was that the school gave us a sheet of the alphabet and which way the letters start etc the spring before K started. I showed that to DS and told him that his teacher gave this to us, to make sure he could do his letters the way a Ker is supposed to do them. That solved the problem. Perhaps you can get something similar from your school.