49 CFR §380.715

1. (a)Training providers must use written assessments to determine driver-trainees' proficiency in the knowledge objectives in the theory portion of each unit of instruction in appendices A through E of part 380, as applicable. The driver-trainee must receive an overall minimum score of 80 percent on the theory assessment.
2. (b)Training instructors must evaluate and document a driver-trainee's proficiency in BTW skills in accordance with the curricula in appendices A through D of part 380, as applicable.