title: "AP Computer Science Principles 3-Day Cram Plan" description: "A focused 72-hour AP CSP rescue plan: pseudocode tracing, the 5 Big Ideas, MCQ patterns, and Create Performance Task survival tips. Reach 50+ in 3 days." date: "2026-01-15" examDate: "May AP Exam" topics:
- AP Pseudocode
- Big Ideas 1-5
- MCQ Practice
- Create Performance Task
You have three days until the AP Computer Science Principles exam. This is not about learning to code — it's about mastering AP Pseudocode, locking in the 5 Big Ideas structure, and drilling the 70-question MCQ patterns that repeat every year.
This plan assumes ~4 focused hours per day. The exam is 70% MCQ (70 questions, 2 hours) + 30% Create Performance Task (already submitted). Skip nothing on this checklist.
Day 1: Pseudocode Basics + Big Ideas 1-2 (4 hrs)
The first 20 MCQ questions test whether you can read pseudocode. Get this automatic.
What to review (90 min)
AP Pseudocode essentials:
- Assignment:
a ← 5orname ← "Alice" - Display/Input:
DISPLAY(message),INPUT() - If/Else:
IF (condition) { ... } ELSE { ... } - Repeat:
REPEAT n TIMES { ... }orREPEAT UNTIL (condition) { ... } - For Each:
FOR EACH item IN list { ... } - Procedures:
PROCEDURE name(param1, param2) { ... } - Lists (1-indexed):
INSERT(list, index, value),APPEND(list, value),REMOVE(list, index),LENGTH(list)
Big Idea 1 — Creative Development:
- Program purpose vs function
- Collaboration, debug strategies, iterative design
Big Idea 2 — Data:
- Binary numbers (2-bit, 8-bit, ASCII)
- Lossy vs lossless compression (JPEG vs PNG)
- Data abstraction, metadata, privacy
What to practice (2.5 hrs)
- Trace 10 pseudocode snippets (assignments, loops, conditionals). Write outputs.
- 5 MCQ on binary conversion (decimal ↔ binary, bit/byte sizes).
- 3 MCQ on lossy vs lossless (identify which compression method).
💡 Highest leverage: Trace one 10-line pseudocode block per day cold. Most students skip this and lose 8-10 points on Day 3.
Day 2: Big Idea 3 — Algorithms & Programming (4 hrs)
This covers ~40% of the exam. Master it.
What to review (90 min)
Variables and data types:
- Assignment, list creation, procedure parameters
- Variable scope (local vs global)
Control flow:
- Sequencing: order matters
- Selection: IF/ELSE branches
- Iteration: loops and their uses
Lists and traversal:
- Index access
list[i] - INSERT, APPEND, REMOVE, LENGTH
- Loop through list with
FOR EACH item IN list - Search and sort conceptually (don't need to code; recognize the algorithm)
Procedures and abstraction:
- Procedural abstraction: breaking a task into a reusable procedure
- Identifying what a procedure does from its code
- Parameters, return values (procedures return a value with
RETURN value)
Undecidable problems & algorithmic efficiency:
- Undecidable = no algorithm can solve it in finite time for all cases (e.g., halting problem)
- Sequential vs parallel computing
- Scalability, redundancy, fault tolerance
What to practice (2.5 hrs)
- Trace a 15-line pseudocode procedure with a list (loop, conditional, APPEND).
- 12 MCQ: trace code, identify bugs, determine output
- 3 MCQ: identify which procedure abstracts a task correctly
- 2 MCQ: classify a problem as decidable/undecidable
⚠️ Trap: When tracing a loop with an index, track the variable value after each iteration. Write it down. Most errors come from losing track of the counter.
Day 3: Big Ideas 4-5 + Full MCQ Set (4 hrs)
What to review (90 min)
Big Idea 4 — Computer Systems & Networks:
- Internet: packet switching, redundancy, scalability
- Packets, protocols, DNS, routing
- Fault tolerance: multiple paths, backup systems
- Bandwidth, latency, throughput
Big Idea 5 — Impact of Computing:
- Digital divide (access gaps)
- Beneficial innovations (medical, communication) vs harmful (surveillance, misinformation)
- PII (personally identifiable information), multi-factor auth, encryption (symmetric vs asymmetric)
- Phishing, malware, crowdsourcing, citizen science
- Computing bias, intellectual property, cybersecurity
What to practice (2.5 hrs — full timed set)
- 25 mixed MCQ from Big Ideas 4-5 (networks, Internet, cybersecurity, impact)
- 20 pseudocode tracing + algorithm MCQ (mix of Big Ideas 2-3)
- 15 review MCQ: your weakest areas from Days 1-2
🎯 Scoring target: 50+ on 70 MCQ = 71% correct. You can skip 20 and still hit a 5 (rough).
Create Performance Task (CPT) — Your hidden advantage
You already submitted your CPT video and written response before exam day. Some MCQ questions will reference pseudocode similar to your program. Review:
- What your program does (its purpose)
- The main data structures you used (lists, variables)
- Your biggest procedures
- Any list traversal or conditional logic you wrote
You don't need to defend your CPT on the exam, but recognizing your own patterns in MCQ code snippets can unlock 2-4 easy points.
Common point-leaks
- Confusing 0-indexed and 1-indexed lists. AP Pseudocode lists are 1-indexed (first item is
list[1], notlist[0]). - Forgetting to trace the loop. Write down variable values after each iteration.
- Skipping "what does this procedure do?" questions. Read the code first; match it to a real-world task.
- Guessing on encryption/security. Know symmetric (same key) vs asymmetric (public/private key).
- Misidentifying lossy vs lossless. JPEG = lossy (removes data, smaller file). PNG = lossless (preserves all).
The night before
Skim the last-minute review checklist. Get 8 hours of sleep — pseudocode tracing requires mental clarity.
Ready to start?
Open the AP CSP topic library → or dive into the MCQ practice guide →. Start with Day 1 pseudocode tracing. You've got this. 🎯