To keep from veering off the seam at the end place your left hand index finger against the outside left edge of the foot when coming to the end. The fabric will not veer. It's second nature for me to do this after I learned it from a very expensive precision quilting workshop. I think once the student realizes her blocks won't match up because of the seams not being accurate she will know then how important it is. It's up to her unless you sew it for her.