SSRs

Answered

Assuming you're talking about Secondary School Reports (aka counselor recommendations)? Your counselor should be tasked with filling it out, and it will usually reflect how you've performed in comparison to and context with others at your school (e.g., how rigorous was your schedule compared to the average student there).

Students typically won't be filling these out though, and unless your counselor shows it to you, you might not even see it. If your counselor needs specific info they will likely ask you directly for it, but you can also set up a meeting with them in the fall to go over your applications and what you're hoping to showcase for different schools.