<p>1) by yourself with materials only: 17
2) with a course, program, or tutor only: 1
3) using both 1 and 2 together: 7
4) no preparation at all: 4</p>
<p>1) by yourself with materials only: 17
2) with a course, program, or tutor only: 1
3) using both 1 and 2 together: 7
4) no preparation at all: 4</p>