I am planning on applying to some competitive universities such as Duke, John Hopkins, etc. I am currently taking a one month long duel enrollment course taught by a community college professor. I feel like he would write a better recommendation letter for me than some of my teachers in my high school. Would it be wise to ask him to write me a recommendation letter, or should I ask a teacher at my high school who taught me longer?
If you believe that the professor would truly write you the best letter, then that is who you should ask. However, in most circumstances it is best to get a teacher who taught you longer because they know you better. The goal is to get a letter from the person that knows you the best. If that is your professor, then ask him.
Good luck with all of your applications :) and have a nice day!
You could always ask him and a teacher from your high school!
I would highly recommend getting both your prof and a teacher to write you a letter. Most applications leave room for a couple extra letters of rec and proving that you have good relationships with your teachers can go a long way. If your extra one is from a professor that you took classes from, it's likely to be weighted similarly and will be very beneficial.
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