Everybody is working on different objectives, so there's no way to do a whole group lesson. This is how it works in my room - 1. Each student will get a different practice, so they can't just copy. Students do the practice, marking answers on a card. Put the card in the scanner to score it.
Computer prints out a report telling which answers are wrong.
I print out a test for the child. He will take it after I go over what he missed on the practice. He'll only get tested on the objectives he got right on the practice. After the test is taken and scored, I print out the next practice pages, which will include new objectives plus any that were not mastered last time. It's a continuous cycle with the practices and tests.