Blog
Guides on GPA, AP exams, statistics, and calculator shortcuts — written to explain the math, not just give the answer.
How to Calculate Your High School GPA (Step-by-Step)
A clear, step-by-step guide to calculating your unweighted and weighted high school GPA — with worked examples and the exact formula your school uses.
Mean, Median, Mode: Which One Should You Use?
Mean, median, and mode each tell a different story about your data. Here is exactly when to use each one — with real examples that make the difference clear.
12 TI-84 Tips Every Student Should Know
Most students use 20% of the TI-84's capabilities. These 12 shortcuts and features cut your test time and help you check work you would normally hand-calculate.
AP Exam Scoring: How the 1–5 Scale Works
The AP 1–5 score comes from a multi-step process most students never see. Here is exactly how raw scores become scaled scores — and what each score means for college credit.
What Score Do You Need on Your Final? (The Exact Formula)
One formula tells you exactly what you need on your final exam to hit any target grade. Here is how it works, when it breaks down, and how to use it strategically.