Guides — SAT and AP preparation

Most students who are stuck do not need more teaching. They need someone to notice which specific mistake they keep repeating. These guides are the part of that we can write down.

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Study what your AP exam is actually worth

Your worst unit and your most expensive unit are usually not the same unit, and only one of them is worth this week.

6 min read · 11 August 2026

A tall stack of expensive hardcover books beside one small brass magnifying glass on a navy backdrop.

SAT

Do you need an expensive SAT course?

The honest answer depends on which of two problems you have — and most students have the second one.

6 min read

Four white ceramic comma sculptures standing in a row on a navy backdrop, the fourth toppled over.

SAT

The four SAT comma rules that are actually tested

Digital SAT punctuation is a short list of jobs a comma can do. Almost every miss is one of four of them.

7 min read

Why these exist

Everything here is the written-down half of what algₐ does while you practise: name the trap, show the check, and refuse to guess when the evidence is thin. Reading it is free and always will be.