How to Customize One PS for 10 Schools

Published on May 14, 2026

Every September, the most common question I get from students is: "Teacher, I finished my PS. Should I rewrite it once for every school?"

My answer is always: "The Common App PS is shared by all schools and cannot be rewritten. Customization happens in the supplements. One PS + 30+ supplements = the customization strategy you need."

Students are confused: "Then how should I customize supplements? Can't I use the same story as a template?"

The answer is: The right way to customize supplements is to use the same material but change the angle according to the prompt. Drawing on 15 years of practice, this article breaks down the customization strategy for 1 PS + N Supplements.

1. The Division of Labor Between the Common App PS and Supplements

2. Why Can't the Common App PS Be Customized?

The Common App system is designed like this:

The truth: The PS is about advertising who I am, not advertising why this school. So using 1 PS for 10 schools is by design.

3. The 4 Major Categories of Supplement Customization

3.1 Why Us / Why This School

Customization key: 80% must be school-specific content.

3.2 Why Major / Why This Field

Customization key: 50-70% shared material: your spike story + your specific interest in the major.

3.3 Identity / Community / Background

Customization key: 30-50% shared material: your identity story can be used multiple times, but the angle changes by prompt.

3.4 Quirky / Creative

Customization key: 100% customized: this type of prompt is completely different at every school.

4. The "3 Specific Things" Principle for Why Us Customization

4.1 What Are "3 Specific Things"?

A Why Us essay cannot write generic lines like "The university has great academics." It must mention 3 school-specific things:

4.2 Example

Bad Why Us:

Yale's strong CS program and beautiful campus makes it my dream school.

Good Why Us (with 3 specific things):

Three things draw me to Yale. First, Professor Sara Bates' "Computing the Mind" course - I read her 2023 paper on Bayesian models for human curiosity, and I want to discuss her chapter on metacognition with her in office hours. Second, the Whiffenpoofs - not because I'll join (I'm a tone-deaf coder), but because their willingness to take an a cappella interlude through finance internships symbolizes Yale's "you can be a CS major AND a singer." Third, Yale's connection to New Haven schools - I want to volunteer at the Yale Pathways to Science program teaching coding to local kids, the same way I taught coding to Pingtung kids.

Why this paragraph is strong:

1. Professor name + specific paper title: shows you researched the school
2. Club name + reflection: not generic admiration
3. Local connection: Yale's relationship with New Haven + your own spike

5. The "3 Layers of Depth" for Why Major Customization

5.1 Layer 1: Why This Field

-> This layer is 100% reusable across all schools

5.2 Layer 2: What You Want to Do Within This Field

-> This layer is 90% reusable

5.3 Layer 3: Why This Major at This School

-> This layer is 100% customized per school

5.4 Side-by-Side Example

Why CS at MIT vs Why CS at Yale:

80% different: that is real customization.

6. Concrete Ways to Research a School

6.1 5 Must-Check Items

6.2 30-Minute Checklist for Researching 1 School

7. The "Framework" for Reusing Supplement Materials

7.1 The 5 Shared Material Banks

Organize your story bank into 5 major themes:

7.2 Match Each Supplement Prompt to Materials

7.3 Example: How a Robotics Club Story Can Be Used in 5 Supplements

Key point: The same event, different angle. Each supplement appears to tell a new story.

8. The 5 Deadly Mistakes in Customization

8.1 Mistake 1: Template Paragraphs

Problem: This paragraph applies to 100% of schools, so it gets eliminated immediately.

8.2 Mistake 2: "Find and Replace" Customization

Changing Yale to Brown and New Haven to Providence: the AO can tell at a glance that you were perfunctory.

8.3 Mistake 3: Research That Is Too Shallow

Mentioning Professor X but not explaining why you want to work with them: the AO assumes you only Googled the name.

8.4 Mistake 4: Using the Same Story for Every Supplement

If all 12 of your Common App supplements are about robotics club, your application looks 1 dimensional.

8.5 Mistake 5: Customizing More Than 80%

Over-customization dilutes your core story, and the AO no longer knows who you are.

9. Workflow: The Production Line for 30+ Supplements

9.1 August: Organize the Material Bank

9.2 September: First Round of Writing

9.3 October: Second Round of Rewriting + Submission

10. The Supplement Tracker System

The Excel tracker template I give Dr. G. students:

12 schools x 3 supplements = 36 essays. Each essay averages 3 drafts = 108 draft slots.

11. The "ROI Formula" for Customization

Time invested in each supplement vs the school's importance:

The truth: One ED supplement should go through 6 drafts, with 5+ hours of school research. If your ED supplement only has 2 drafts, your ED admission probability drops by 50%.

12. Conclusion: 1 PS + N Supplements Is Engineering

In the past 15 years, I have seen too many students write a strong PS but use templated supplements -> rejected by all 12 schools. Supplements are where the competition is truly decided.

My final reminder to Dr. G. students:

Levels of customization:- Common App PS: 100% not customized- Why Us: 80%+ customized- Why Major: 50-70% reused + 30% customized- Diversity / Identity: 30-50% reused + 50% customized- Quirky / Creative: 100% customized

5 major material banks: Academic Spike, Leadership, Service, Identity, Curiosity. One event can be varied into multiple angles.

If you customize supplements well for 12 schools, you have beaten 80% of applicants. This has higher ROI than scoring 50 more points on the SAT.

Further Reading:

• How to Write the 650-Word Common App Personal Statement
• How to Write a Why Major Essay That Does Not Become Empty Talk
• How to Research Schools for a Why University Essay That Shows Fit
• How Many Rounds of Essay Revision Are Enough
• Grade 12 September-December Timeline