It is very important for the instructor to know how to best reach their student academically to ensure the student is grasping the concept.  There are various types of learners, such as auditory, visual, and kinesthetic.  The instructor can give a short learning style test to determine a student's learning style so that when teaching/tutoring is taking place, the student gets it because the instructor is teaching to how the student best learns.  If you Google learning style tests, hundreds of web sites will pop up and free tests can be obtained to give to students.  Most learners are visual learners; however it is best to test your students to determine their learning style.