I changed my high school after my 10th-grade exams. My 11th and 12th-grade classes were conducted online due to COVID-19. I don't really have any kind of relationship with any of my current high school teachers since everything was conducted online.
Can my previous High School teachers write recommendation letters for me or is it mandatory to get it written by someone from your current High School?
Great question! Lots of students struggle with who to ask for recommendations, so you are definitely not alone in this.
In general, colleges like to see that you have letters from 11th or 12th grade, so I would make sure to get one letter at least from a teacher at your new school. As others have noted, they are still able to comment on your performance in class and may be able to say that your presence is felt and appreciated even in a virtual format in a new setting. However, a recommendation from 10th grade is perfectly valid, especially if you had a strong relationship with the teacher you're asking. If they can comment on your growth, your presence in a classroom, and maybe even your contributions outside the classroom (perhaps they are also the advisor for a club or a coach for a team you're on), all the better!
I hope this helps; best of luck in this and the rest of the college admissions process!
You can definitely ask for letters of recommendation from your previous high school! Any teacher/counselor you interacted with during your four years of high school can write a letter for you.
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The general rule of thumb is the more recent the better so I would add one from a recent teacher from a class you did well in as well for some that require two or more letters. They might not know you the best but they can still speak about how you are as a student.