Good tip for continuity from year to year

One teacher I observed today has students summarize their notes for a chapter test in a specific notebook.  The teacher provides composition books for each student (with their name labeled on the spine), and the notebooks usually stay at school, but students are allowed to take them home on the night before a test. The students can take one to two pages of notes to summarize the main ideas from the chapter, as well as diagrams or formulas.  Tomorrow, the students can use the notebook during the last 10-15 minutes of the test.  At the end of the school year, the students have a notebook that contains all the major ideas from the course, and they can take that with them for the following year of math, building continuity of math learning.  Have you ever forgotten the unit circle values for sine and cosine?  Flip back to chapter 2 of pre-calc, and you'll have all the important points right there.  The other advantage of the notebook is the process of making the summary is a great tool for studying.