Grammar cannot be taught in ten minutes a day. Grammar cannot be taught through rearranging cards. Even if you don't use the Beka program in middle school, try to switch over to it in seventh grade. A Beka Book grammar is precise, demanding, and detail-oriented. It may drive you crazy, but that's perfectly all right.
Good writers are precise and detail-oriented too.
But after reviewing multiple grammar programs in this past year, I came back to A Beka as the best around. Put statements in positive form. A common way to fall into wordiness is to present a single complex idea, step by step, in a series of sentences that might to advantage be combined into one. Express coordinate ideas in similar form. These principles and many others are explained and illustrated.