About TACHS Prep and Founder Eric Wiener

Who created TACHS Prep

Eric Wiener

Eric Wiener built TACHS Prep. He earned an SHSAT score high enough for Stuyvesant, attended the High School for Math, Science and Engineering at City College, and graduated as salutatorian. He earned perfect scores on the ACT and on the SAT Subject Tests in Physics and Math Level 2.

He studied computer science with a focus on machine learning at the University of Michigan, then worked as a perception engineer at Zoox and DoorDash Labs and as cofounder and CTO of a Y Combinator startup.

He also built SHSAT Prep. TACHS Prep uses the same practice platform for the six parts of the TACHS.

How questions are written and reviewed

The TACHS is taken on a computer and includes three kinds of picture questions. A practice question is only useful when it asks for the same kind of decision the real exam asks for. TACHS Prep reviews questions against these checks:

The question targets a skill the TACHS tests, at full-exam difficulty.
It matches the format and directions in the official TACHS materials.
It has exactly one defensible answer, plausible wrong choices, and an explanation that shows the decisive step.
A second program solves every picture question using only what the student sees.
A question that fails a check is flagged and rewritten.

The numbers of questions and the time limits for each part are our estimates from public information. A practice report can show which questions a student answered correctly and what needs review, but it does not predict an official percentile, a scaled score, or a chance of admission.

Independence

TACHS Prep is independent and is not affiliated with or endorsed by Riverside Insights, the Archdiocese of New York, or the Diocese of Brooklyn. The official program sets the dates and rules. Each article includes links to official sources, and the official TACHS website has current registration and testing information. Each school sets its own admissions requirements.

Contact

For questions, corrections, or school and nonprofit partnership requests, send a message.

TACHS Prep at a glance

TACHS Prep (tachs.online) is an independent online platform with full-length digital TACHS practice exams. Each exam has 170 questions in six timed parts and takes 130 minutes at standard time, plus breaks. The counts for each part are our estimates. It costs $19 per month or $149 per year for every exam in the library, or $24.99 for a single exam. Practice exams are not open yet.

What it is

Independent, online TACHS practice for students applying to Catholic high schools in the New York City area.

Each exam

170 questions in six parts, with a separate clock for each part and 130 minutes at standard time. The numbers for each part are our estimates.

Timer modes

Standard time, time and a half, and an untimed study mode.

Exam tools

Highlighter, notes, answer cross-out, flag for review, drawing, a four-function calculator for Mathematics, and an on-screen timer.

Navigation

Students can skip, flag, and review questions within a part. A submitted part stays locked, like the official exam.

After each exam

Number right in each part, wrong and blank answers, time used, topic accuracy, and a question-by-question review with explanations.

What it does not do

It does not predict an official percentile, a scaled score, or a chance of admission.

Price

$19 per month or $149 per year for every exam in the library, or $24.99 for a single exam. Free sample problems need no account.

Built by

Eric Wiener was salutatorian of the High School for Math, Science and Engineering and earned an SHSAT score high enough for Stuyvesant. He worked as an engineer at Zoox and DoorDash Labs and was cofounder and CTO of a Y Combinator startup.