Hi Robert: Skill testing is kind of of a special category. Yet, if students don't have the practial skills they need for class they will be limited in how you can advance their learning. Some teachers will gathers students with special or certain practical needs into a group and the teacher or a more advanced student can work with the weaker students to bring them up to speed. Another version is to have students demonstrate specific skills, then have the class critique or give suggestions. Practice is the best teacher with manipulative skills. So, extra practice assignments might be in order. Pretesting will let you plan these needed activities. Regards, Barry