Letters of recommendation are one of the most important parts of your college application that you cannot write yourself. A strong letter from a teacher who knows you well can be the factor that tips an admissions decision in your favor, while a weak or generic letter does nothing for you. The good news is that getting strong letters is not about luck. It is about building genuine relationships with your teachers throughout high school and asking the right people at the right time. This page covers who to ask, when to ask, how to prepare your recommenders, and common mistakes to avoid.
Who to Ask
Most colleges require 1 to 3 letters of recommendation from teachers. The most effective recommenders are teachers who know you well (they can write about your specific qualities, not just that you got an A in their class), who teach subjects relevant to your intended field (for pre-med students, a science teacher and a math or English teacher are ideal choices), who have seen you at your best (overcoming a challenge, leading a group project, asking thoughtful questions, helping classmates), and who genuinely like working with you (a teacher who is enthusiastic about recommending you will write a more compelling letter than one who is doing you a favor).
Junior-year teachers are the most common recommenders because they have the most recent and substantial knowledge of your academic work. However, a sophomore-year teacher who knows you exceptionally well can also write a strong letter. Some students also ask a non-teacher recommender (a research mentor, volunteer supervisor, employer, or coach) for a supplemental letter if the person can speak to qualities that teachers cannot observe, such as your clinical experience, leadership outside school, or work ethic.
When to Ask
Ask your recommenders at the end of junior year (April or May) or at the very beginning of senior year (September). This gives them several weeks to write a thoughtful letter before your first application deadlines. Asking earlier is better: popular teachers receive many recommendation requests, and asking early ensures they have time to give your letter the attention it deserves. Asking in October or November, weeks before a deadline, puts your recommender under unnecessary pressure and may result in a rushed letter.
When you ask, do it in person, not by email. A brief conversation after class or during office hours shows respect for the teacher’s time and gives them the opportunity to ask questions about your goals. If the teacher hesitates or says they are already committed to too many letters, do not take it personally. Thank them and ask someone else. A teacher who is reluctant to write your letter will not write a strong one.
How to Help Your Recommenders Write a Great Letter
Even the best teacher cannot write a detailed, specific letter without information from you. After they agree to write your recommendation, provide them with a brief document (sometimes called a “brag sheet” or “recommender packet”) that includes your resume or activity list, a brief description of your academic and career goals (including your interest in healthcare), specific examples of moments in their class that you are proud of (a project you worked hard on, a concept you struggled with and eventually mastered, a discussion where you contributed meaningfully), any specific points you hope they will address (your intellectual curiosity, your growth over the year, your ability to work with others), and your list of schools with their deadlines, so they know when each letter is due.
This packet makes the teacher’s job easier and results in a more specific, compelling letter. Teachers write hundreds of recommendations over their careers, and the students who provide helpful context receive stronger letters than those who simply ask and provide no additional information.
What Makes a Strong Letter
The best recommendation letters include specific anecdotes that illustrate your character: not “she is a hard worker” but “when she struggled with the thermodynamics unit, she came to every office hour, formed a study group with classmates, and ultimately earned the highest score on the unit exam, demonstrating the persistence and resourcefulness that I believe will serve her well in medicine.” They describe your intellectual qualities: curiosity, analytical thinking, creativity, willingness to ask questions, and ability to connect ideas across disciplines. They speak to your character beyond academics: kindness, integrity, leadership, humility, and how you treat classmates and others. And they convey genuine enthusiasm for recommending you, which signals to admissions officers that this student made a lasting positive impression on someone who knows many students.
Common Mistakes to Avoid
Asking teachers who do not know you well: A generic letter from a prestigious-sounding teacher (department chair, AP® teacher) is less valuable than a specific, warm letter from a teacher you had a genuine relationship with, even if that teacher teaches a less “impressive” course.
Asking too late: Rushing your recommender leads to rushed letters. Give at least 4 to 6 weeks of lead time, ideally more.
Not following up: Gently check in with your recommender 2 to 3 weeks before the deadline to make sure they are on track. A brief, polite reminder (“I wanted to check in and see if you need anything else from me for the recommendation”) is appropriate and appreciated.
Forgetting to say thank you: Write a handwritten thank-you note after your recommenders submit their letters. This is basic professionalism, and it matters. Update them on your admissions results when you have them. They invested time in your future and deserve to know the outcome.
For the broader application context, see our college application guide and personal statement basics page.
The Supplemental Recommendation: Some colleges accept or encourage an additional recommendation from someone outside the classroom: a research mentor, employer, volunteer supervisor, coach, or community leader. If you have a strong relationship with someone who can speak to qualities your teachers might not see (your work ethic in a clinical setting, your leadership in a community organization, your dedication as an athlete or performer), consider asking them for a supplemental letter. Keep in mind that supplemental letters should add new information, not repeat what your teacher letters already say. A supplemental letter from your hospital volunteer supervisor who describes your compassion, reliability, and growth over two years of weekly volunteering adds a dimension to your application that a classroom teacher cannot provide.
What to Do If You Are New to Your School: Transfer students and students who are new to their school may not have built the deep relationships with teachers that produce the strongest letters. If this is your situation, prioritize building connections quickly: attend office hours, participate actively in class, introduce yourself to your teachers, and share your interests and goals. Even one year of a strong relationship can produce a meaningful letter if the teacher has seen you engage deeply with their subject. You can also ask a teacher from your previous school to write a letter, as long as that teacher can speak specifically to your academic abilities and character.
Counselor Letters: In addition to teacher letters, most colleges require a letter from your school counselor. This letter provides context about your school (academic offerings, socioeconomic demographics, grading system) and your place within it (class rank, course rigor, personal circumstances the counselor is aware of). Meet with your school counselor at least once during junior year to introduce yourself, share your goals, and discuss any circumstances (family challenges, health issues, school transitions) that you want reflected in the counselor letter. Counselors who know your story can provide context that strengthens your application significantly. Counselors who do not know you will write a generic letter based on your transcript alone.
References
National Association for College Admission Counseling (NACAC). “Letters of Recommendation.” NACAC, 2025. https://www.nacacnet.org/. Accessed March 2026.