I wanted to apply to Columbia but I was looking at the graduate admissions instructions so I wrongfully thought that I needed 3 teacher recommendations. So far I know one teacher has finished theirs and I don't think the other two have started. Is it okay to go to a teacher that has not started and ask them to not write one?
Also the teacher I really wanted a rec letter from is probably the one that hasn't started for sure. Since I asked my art teacher for the extra one would it be okay to use that one to send to art schools and use the other two to send to "regular" schools?