CHS-P1 Cheat Sheet 2026: One-Page Review of Must-Know Facts

The CHS-P1 Exam on One Page

This page condenses what you need to know about the CodeHS Python Level 1 Certification into a single scannable review. CHS-P1 here means the CodeHS credential specifically, not Python Institute's PCEP, a course-completion certificate, or a teacher microcredential. If you are weighing whether to sit for it, start with the facts below, then branch out to deeper guides such as the CHS-P1 study guide and the complete guide to all 7 content areas.

Every fact in this cheat sheet comes from CodeHS's published certification materials, last reviewed October 5, 2026. Where CodeHS has not published a number, this article says so rather than guessing.

Format, Scoring, and Timing Facts

Do the arithmetic once so it does not distract you on exam day: 45 questions in 90 minutes gives you an average of two minutes per question. For a code-tracing item that is generous, which means pacing is rarely the main risk. Careless reading is. For a closer look at the cutoff, see exactly what you need to pass.

Vouchers, Retakes, and Expiration

The money side of CHS-P1 is handled through vouchers rather than a public price tag. CodeHS provides school and district voucher pricing by direct quote, and no public numeric fee was verified for this review. That means you should not trust a specific dollar figure unless it comes from your school or from CodeHS itself. The certification cost breakdown covers how to approach pricing questions.

The practical takeaway is that a failed attempt has a real cost to your school or district, which is why preparing before you test is worth the time. Because vouchers lapse with the contract, scheduling matters too. Check your teacher's timeline against your own readiness, and see exam dates and scheduling for how to plan around it. Eligibility questions are answered in the requirements guide.

Exam-Day Rules and Focus Mode

CHS-P1 is proctored through the CodeHS Certifications app and Proctor Dashboard, with a teacher or authorized proctor monitoring. You can test at home or at school. The exam relies on an Honor Code, randomized question selection, and a feature called Focus Mode.

Allowed

• The provided Python examination reference sheet
• Paper, a pencil, and a calculator (all suggested by CodeHS)
• Extended-time and read-aloud accommodations, which are supported

Prohibited

• External websites
• Collaboration with anyone else
• Copying or sharing exam questions
• Running code in another website or program

That last item matters for a Python exam. You cannot paste a snippet into an online interpreter to check your answer, so you need to be able to trace code by hand. Practice that skill with paper and pencil, because it is the skill the exam actually tests. Accommodation requests beyond extended time and read-aloud require platform review, so raise them with your teacher well ahead of test day.

The Seven Exam Domains at a Glance

CodeHS lists seven top-level topic groups in its exam overview. These are official exam-topic groups, not course-module counts and not a percentage-weighted blueprint. CodeHS has not published domain weights, so avoid any source that claims to know how many questions come from each area. For the full breakdown, read the domains guide.

Code Patterns Worth Memorizing

The reference sheet helps, but speed comes from recognizing patterns on sight. These are the ones that show up again and again in Python Level 1 material.

Slicing Cheat Sheet

For any list or string x, x[a:b] starts at index a and stops before index b. Leaving a side blank means "from the beginning" or "to the end." A negative index counts from the end, so x[-1] is the last item. Because the stop index is excluded, the length of x[a:b] is b - a when both are in range.

Loop Counting

range(n) produces 0 through n - 1, giving exactly n iterations. range(a, b) starts at a and stops before b. When a question asks how many times a loop runs, count iterations rather than looking at the final value.

Two-Dimensional Lists

The first index selects the row and the second selects the column. A nested loop usually has the outer loop walking rows and the inner loop walking items within each row. If a question prints inside the inner loop versus after it, the output shape changes completely.

Return Versus Print

A function that prints does not hand a value back. If code assigns the result of such a function to a variable, that variable holds None. Questions about program structure often hinge on exactly this distinction.

Common Traps in Python Multiple-Choice Questions

Multiple-choice Python questions rarely ask you to recall a definition in isolation. They show a short program and ask what it outputs, which line causes a problem, or which snippet achieves a goal. The wrong answers are usually plausible results of a specific misunderstanding. Learn the misunderstandings and you can eliminate distractors quickly.

• Mutating versus returning: Some list methods change the list in place and return nothing useful, so assigning their result to a variable gives None. String methods, by contrast, return a new string and leave the original untouched because strings are immutable.
• Exclusive stop index: The end of a slice and the end of a range() are both excluded. Many wrong answers are the right answer plus or minus one item.
• Integer versus float division: / always produces a float, while // floors the result. A distractor often differs only in a trailing .0.
• Condition ordering: In an if/elif chain, only the first true branch runs. Reordering conditions can change the output even when the conditions look equivalent.
• Misplaced indentation: Python uses indentation to define blocks, so a line inside versus outside a loop or conditional changes behavior entirely.
• Using continue versus ending the loop: continue skips the rest of the current iteration but keeps looping. Do not confuse it with stopping the loop altogether.
• Type mismatches: Combining a string and a number with + raises an error unless one is converted first. Questions in the Data Types and Error Handling areas lean on this.

For a candid look at how demanding these items feel in practice, see how hard the CHS-P1 exam is.

Scheduling Your Review Around the Domains

If you have a few weeks, order your review by dependency rather than by the order topics appear on a list. Lists and Strings reuse indexing and slicing logic, loops depend on conditionals, and Error Handling is easier once you have seen real programs. One reasonable arrangement is below; adjust it to your own gaps.

Introduction to Python Programming is the recommended preparation, and CodeHS also lists a matching Level 1 Certification Practice course in its practice catalog. Neither one defines extra exam domains; they are practice resources. For a fuller plan, the study guide expands this outline, and you can test yourself on the CHS-P1 practice test site to find weak domains before you spend a voucher.

Results, Certificate, and Where It Fits

CodeHS releases results within 36 hours on school days. You receive an overall score plus a topic-level performance report, which is useful if you need to retake because it shows which of the seven areas to rebuild. Successful candidates receive a downloadable certificate, and earned certificates expire after 10 years.

As an entry-level credential, CHS-P1 signals that a student can read and write foundational Python, which is most relevant for school-based pathways, portfolios, and college applications in computing. CodeHS has not published salary or hiring data tied to this certificate, so treat any earnings claim skeptically. The worth-it analysis weighs the value honestly, and the salary guide explains what can and cannot be said about pay.

Frequently Asked Questions

Use this cheat sheet as your checklist, then pressure-test your knowledge with timed questions on the practice test site so that the rules, the format, and the seven domains all feel familiar before you start your single attempt.