Section 01
What makes this diagnostic different
A conventional diagnostic tells you what your child got wrong. The Reta Razão Structural Diagnostic tells you why — and how the error was produced.
We apply FMEA — Failure Mode and Effects Analysis, a methodology originally developed in engineering to identify how and why systems fail. Each question your child answers — across every section of the exam — is individually classified by format, reasoning type, difficulty level, and execution process. Where the student answered incorrectly, we analyze the specific answer chosen to understand the mechanism that produced the error.
The result is not a score report. It is a structural map of how your child thinks — across mathematics, reading, and writing — where their strengths are, where errors originate, and which specific patterns account for lost points.
🗺️
Error Address Map
A matrix that locates the exact intersection of presentation type and cognitive skill where each error occurs — across all sections. Not “algebra” or “reading” — but the specific mechanism that produced the mistake.
🎯
Failure Priority Ranking
Each error pattern is ranked by frequency and severity. This determines what to work on first for maximum point recovery in minimum time — whether it lives in Math, Reading, or Writing.
📊
Targeted Projection
Based on data — not intuition — the diagnostic estimates how many points are recoverable and what specific changes would produce the improvement, with differentiated timelines by section.
Section 02
Why the diagnostic comes first
Most SAT and IB preparation begins with content review: the tutor covers topics, assigns practice, and adjusts based on what seems to be working. The student’s actual error patterns are discovered gradually — through trial and error over weeks or months.
The diagnostic-first approach reverses this. Before any instruction begins, the structural diagnostic maps the student’s cognitive profile across every assessed section. Every session from day one targets the specific patterns that actually cost points.
Conventional approach
- Practice test → score by section
- “You need to improve in algebra”
- Generic content review for weeks
- Tutor discovers patterns by trial and error
- Same curriculum for different students
- Progress measured by overall score
Diagnostic-first approach
- Every question classified across multiple dimensions
- “Your errors originate in translation, not calculation”
- Targeted intervention from the first session
- Error mechanisms identified before instruction begins
- Program designed for each student’s specific profile
- Progress measured by error pattern elimination
The practical difference: without a structural diagnostic, the first weeks of tutoring are essentially exploratory — the tutor is still figuring out where the real problems are. With the diagnostic completed first, no time is wasted on content the student already commands, and no critical gap goes undetected.
Section 03
What the diagnostic reveals — a real example
The following case illustrates what the structural diagnostic produces when applied across the complete SAT. A conventional assessment would report a composite score and a list of topics to review. The diagnostic revealed something far more specific — and far more actionable.
When we analyzed this student’s 154 questions across all three sections (Math, Reading, and Writing & Language), what emerged was not three separate problem areas, but a single underlying pattern that manifests differently in each section.
Math — 86.2% accuracy
Solving the wrong equation correctly
The student scored 100% on every hard question where written work was produced. But on questions worked entirely in her head, she translated the problem into a slightly incorrect model — and then solved that model flawlessly. All 8 errors occurred without any written trace. When she wrote, she was perfect. When she didn’t, she solved a problem that was close to the one asked — but not the one asked.
Reading — 76.9% accuracy
Choosing a plausible answer over the supported one
Across four different passages, the student substituted her own interpretation for the author’s intended meaning — choosing the answer that was intellectually appealing rather than the one best supported by the text. When uncertain, she defaulted to the “deeper” literary reading. The SAT rewards the answer supported by the passage, not the most sophisticated one.
Writing — 75.0% accuracy
Selecting the word that roughly fits
On questions requiring precise word choice, the student selected options that were close in meaning but not the exact match for the passage’s tone and context. This was her weakest skill across both sections — and it follows the same logic: an answer that is reasonable, but not the most precise available.
The unifying pattern across all three sections
This student consistently selects the answer that is “close enough” rather than the one that is precisely correct.
In Math, she translates the problem approximately and solves the approximation. In Reading, she chooses the plausible interpretation over the text-supported one. In Writing, she selects the word that roughly fits rather than the exact match. The mechanism is the same — it simply presents differently depending on whether the material is numerical, textual, or linguistic.
This discovery has a direct practical consequence: interventions that build precision in one section transfer to the others. The habit of checking whether an answer is the best rather than merely reasonable improves performance across Math, Reading, and Writing simultaneously. A conventional approach — treating each section as an independent problem — would never detect this.
| Section | How the pattern manifests | What the intervention targets |
|---|
| Math | Translates a real-world scenario into a “close enough” equation, then solves the wrong equation correctly | Scratch-work protocol for modeling questions — forcing the translation step to become visible and checkable |
| Reading | Projects her own interpretation onto the text instead of adopting the author’s perspective | Pre-answer protocol: What is this passage doing? Whose perspective does the question ask about? |
| Writing | Selects a word or phrase that is close in meaning but not the precise match for tone and context | Elimination discipline: remove the “close” options systematically before choosing the best remaining match |
Additionally, the diagnostic identified a small, isolated grammar gap — two easy-level pronoun agreement errors in Writing — that requires only targeted review, not a shift in approach. These are concrete, learnable rules that can be addressed in days and yield immediate score gains.
→
1470–1500
Projected with interventions
The central point: this student does not need to learn new material. She needs a small number of procedural adjustments — a scratch-work habit in Math, a perspective-checking protocol in Reading, an elimination discipline in Writing — all derived from the same underlying finding. The diagnostic did not produce three separate recommendations. It identified one pattern and designed one coherent intervention that addresses all three sections.
Section 04
Scope of the diagnostic
The structural diagnostic is available for the SAT (all sections: Math, Reading, and Writing & Language) and for the International Baccalaureate programme. For IB students, the diagnostic is adapted to the criterion-based assessment system — identifying which assessment criteria are consistently underperforming, what type of assessment triggers the most errors, and how these patterns connect to predicted grades.
The diagnostic produces two documents: a Parent Report that translates every finding into clear, practical language with concrete recommendations and estimated timelines; and a Technical Report containing the full quantitative analysis — all metrics, all matrices, all error classifications. Both are delivered in full transparency.
Section 05
Investment and next steps
The structural diagnostic is designed to function both as a standalone deliverable and as the foundation of a full preparation program.
Full credit toward the program
The diagnostic fee is credited in full toward the preparation program if you choose to enroll within 30 days of receiving the report. If you enroll, the diagnostic was included at no additional cost. If you decide not to proceed, you keep the full report — a detailed structural map of your child’s profile that no other service provides.
Enroll within 30 days → diagnostic fee fully credited
Whether or not you proceed with the program, the diagnostic report is yours. It contains enough precision to guide any tutor or educator working with your child — even outside of Reta Razão.
The diagnostic is not a test — it is a lens. It gives you a level of understanding about your child’s learning profile that would normally take months of observation to develop. Every recommendation that follows is grounded in data, not intuition.
