I summarised information from my textbooks. I did this in 3 sections.
1. Use the notes that you have compiled from school and combine these with summarised notes taken from your textbooks that are seperated into different topics.
2. Summarise these notes.
3. Continue this until one whole complete topic is on one A4 page.
By using this technique, you will be able to recall large amounts of information from one A4 page.
Once your topic notes can fit onto one A4 page, record these onto a tape, so you can play them back and listen to them when necessary. It is a lot easier then carrying a bunch of notes around, or your textbook.
Also, throughout some stage of the year, you should get a copy of the syllabus dot-points and summarise these points from your textbook. These are the most reliable notes as they are what is officially examined in the course.
If you take time out to create these sets of notes, you will have no trouble in obtaining great knowledge about concepts of the course.