I am wondering if Boris could be more intentional during the course as well as looking for review at the end. If he created touchpoint assessments, that could then be repeated at the end of the unit, he would get maximum student impact for less teacher workload. For example, if Boris created a multiple choice exam that provided information for incorrectly answered questions, students would have the review and a place to receive immediate learning opportunities. For example, if they get a question incorrect on one particular element, an interactive periodic table could pop up with information about that element. Other possibilities could be lab simulations, videos, review notes, connections to discussion forums, etc. This way the review is more frequent, more manageable and could be again used before the summative unit exam.