Now is the time when seniors must add college recommendation letters to their long list of admissions requirements.
The University of California and California State University systems do not require, recommend or read letters of rec., so don't send any; they'll immediately be thrown in the nearest trash can.
However, private and out-of-state colleges normally require them as part of the application process.
In October, teachers get slammed with requests to write letters. English teachers take on the brunt, often writing more than 50 letters a year. You'll certainly hear from teachers that they'll cap the number of letters they choose to write, and many will do so in order to write very personalized and authentic letters for those students who they believe have the most potential. It's easy to write about a student who made a positive impact in class, and painful to write letters about students they barely know.