There are real cases that show this clearly. According to Fox News, former U.S. President Biden personally wrote a recommendation letter for the son of his son Hunter’s Chinese business partner, and even sent the letter directly to the president of Brown University. The result? The letter was filled with empty praise throughout, with almost no substantive description of the student himself—the application still failed.

No matter how prestigious someone’s title is, if they do not truly know you, they cannot write convincing content. Yale University explicitly states on its official website that recommendation letters should come from teachers who truly know you and have taught you in core academic courses. A letter with specific details and real stories is far more powerful than any celebrity endorsement.

The teachers you like may not necessarily be suitable for writing recommendation letters.

Choosing a recommender is not about choosing your favorite teacher, but about choosing the teacher who knows you best and is most willing to advocate for you.

A teacher who seems very nice does not necessarily write a strong recommendation letter for every student. The teachers who can truly help you are those who have a genuine impression of you and have witnessed your hard work in class.

There is a simple way to test this: ask the teacher directly, “Do you feel you can write a strong recommendation letter for me?” If the teacher hesitates or gives a vague answer, that is your answer.

In addition, many students think they must find a teacher who gave them an “A.” In fact, grades are not the most important factor. If you consistently put effort into a class, actively participate in discussions, ask thoughtful questions after class, and allow the teacher to see your hard work and enthusiasm, then even if your grade is not perfect, that teacher could still write a very powerful recommendation letter.

Finding the right subject is more important than finding the right personal connection.

It is best for recommendation letters to come from teachers in core academic subjects: Mathematics, English, Science, History, Social Sciences, or Foreign Languages. No matter how good your relationship is with a sports teacher or an art teacher, they are usually not the preferred choice. For prestigious schools, a recommendation letter is first and foremost evidence of academic ability.

The most recognized combination is one humanities teacher and one STEM teacher: one from a math or science teacher, and the other from an English, history, or language teacher. MIT explicitly requires exactly this.

In terms of timing, prioritize teachers who taught you in 11th or 12th grade. UPenn’s official website states very clearly that recent teachers are best able to present your current and authentic academic performance. If you ask a teacher who taught you three years ago, they may already have difficulty remembering you clearly.

Finally, Counselor recommendation letters absolutely cannot be ignored.

A counselor recommendation letter is not used to prove your performance in a specific class, but to portray you as a person from a broader perspective: your overall performance in school, your growth trajectory, and the impact of your school environment on you. Almost all Top 30 schools require submission of a counselor recommendation letter. The principle for choosing a counselor is the same as choosing a teacher: choose the person who knows you best, not the person with the highest rank.

Second thing: Enable the teacher to write it

After finding the right person, the next thing to do is to enable the other party to truly write a good letter.

Even for the teacher who has the best relationship with you, it is impossible to remember every single detail in your class. What you can do to help them is to provide enough and specific enough materials.

This is the role of the Brag Sheet.

A Brag Sheet is not about bragging, but a tool to help teachers “recalled”—what kind of deep assignments you have done, what good questions you have raised in class, and what projects you completed that left a deep impression on the teacher. The more specific this material is, the more detailed and convincing the recommendation letter written by the teacher will be.

At the same time, give your activity list, initial essay drafts, and general school selection direction to the teacher to look at together, letting them have a complete understanding of your overall application. This way, when teachers write letters, they can consciously echo your other application materials, instead of praising you wildly out of nowhere.

A recommendation letter is not necessarily more helpful just because it is filled with strong praise.

A recommendation letter that does not match the application materials is not only unhelpful, but also makes admissions officers have questions about your overall materials. Communicating clearly with the teacher in advance about which aspects you hope the letter will focus on highlighting is much safer than letting the teacher improvise freely.

Third: Do not cross the two red lines

The first two points are about how to do this well. This part is about what you should never do.

The first line: Do not have someone ghostwrite or submit recommendation letters on your behalf.

This is an absolute red line. If a recommendation letter is sent from a private email address (Gmail, Hotmail, etc.), admissions officers can notice it almost instantly. American universities have very strict verification of the authenticity of recommendation letters—once questioned, admissions officers will directly contact the recommender themselves to verify, at which point you will have no room for maneuver.

If you have concerns about the quality of the Counselor recommendation letter, you can completely invite an additional person who knows you to write a supplemental recommendation letter, which is a legitimate and widely accepted practice.

The second line: You must check “Waive rights to review”.

This is an important signal to prove the authenticity of the recommendation letter to admissions officers. Giving up the right to view the recommendation letter will instead make your application more credible.

Timeline: Start from now

The preparation of recommendation letters starts earlier than most people think.

11th grade spring (March–May): Determine your application direction and general school list range, evaluate which teacher is most suitable to advocate for you, and begin consciously deepening your interaction with these teachers.

Before summer vacation (May–July): Organize your Brag Sheet, activity list, and school list, and ask the teacher in person to confirm their willingness to write the letter.

After 12th grade school starts (August–October): Communicate with teachers about the specific direction and focus of the recommendation letters, and formally send invitations through the application system.

After admission results come out (October–March of the following year): Inform teachers of the results in a timely manner and send a sincere thank-you email. Regardless of the outcome, this is something you should do.

A good recommendation letter can allow admissions officers to see a three-dimensional version of you beyond the rest of your application materials. And this is something you can start preparing for now.