This is a good question, as it is often a problem with keeping up with school.
In Australia here, I went to a private high school. When I was in hospital they would send me work and I worked on that with the hospital school. I went into school at every opportunity I could, and had tutors outside the school when needed.
It was hard, but I survived. I did my year 12 certificate (called a HSC) over 2 years and graduated, then went on to university. <img src="i/expressions/face-icon-small-smile.gif" border="0">