Do we have to invite teachers and counselors multiple times depending on the number of colleges or the one recommendation we receive can be used for all the colleges.
With the Common App you invite them once. Each teacher writes one letter that is general enough for all the schools.
Are you applying to any schools that don’t use Common App? If you are check with the guidance counselor about how they handle it. My son’s school doesn’t have Naviance. He had to provide stamped, addressed envelopes for the non CA schools. I find the whole thing confusing but everything has apparently been received.