one moment…
built on the questions you got wrong
what a $70-an-hour tutor really sells you is someone who knows exactly why you keep getting things wrong. locus does that part for free, from the mistakes you have already made.
8 official content domains · 8 root causes · 8 real 2026–27 test dates
not just which colleges take you: scholarships, and in some cases hiring years later. students with money buy a structural advantage. everyone else gets generic practice tests and no system for turning a wrong answer into anything.
300+ points
average SAT score gap between the highest- and lowest-income families. Roughly a third of top-income students score 1,300+, against under 5% of middle-income students.
Harvard-affiliated study, 2023
~$70 an hour
the average price of private SAT tutoring. $45–100 is typical, and $200–400+ an hour for elite specialists.
tutoring-industry pricing
$1,600+ a course
what a full 20–30 hour prep engagement costs, running past $10,000 at the top end.
tutoring-industry pricing
and the number follows you. Bain, McKinsey and Goldman Sachs are among the firms known to ask college recruits for their SAT scores, years after high school.
every figure, citedevery mistake becomes a mapped, explained, revisited data point instead of a forgotten wrong answer.
lumen, the part a tutor is actually for
a score report gives you the first one. the second is the whole of what a tutor is for, and it is the axis every mistake in locus is also filed against.
Conceptual gap
You didn't know the underlying rule or idea yet.
Relearn the concept before doing more questions on it.
Careless slip
You knew it, but arithmetic or transcription went wrong.
Slow the final step and re-read what you wrote down.
Misread the question
You solved a slightly different question than the one asked.
Underline exactly what the question asks for before solving.
Vocabulary gap
An unfamiliar word decided the answer for you.
Bank the word with the sentence you met it in.
Unsupported answer
Your choice sounded right but the text never backed it.
Point to the line that proves it, or eliminate the choice.
Time pressure
You rushed and took the first plausible option.
Practice this question type on a timer, not untimed.
Right idea, wrong execution
Your approach was sound; a step in the middle broke.
Redo it writing every step out, no mental shortcuts.
Something else
Doesn't fit the usual categories.
Revisit this one with fresh eyes.
nothing here is a placeholder. the classifier, the map and the planner all read from the College Board’s own published domains and their published share of each section.
content domains
Reading and Writing
Math
2026–27 test dates
pick one and the planner works backward from it, sequencing the official Bluebook practice tests and flagging 7 and 11 as the harder two so a low score on those does not read as a panic signal.
no card, no tutor, no extra practice tests. bring a question you got wrong and locus will tell you why.
who made this
locus is one student, working alone.
No team, no company, no funding. Tutoring costs about $70 an hour, and the part that money buys, someone who can tell you why you keep getting things wrong, turned out not to be the expensive part to build. That is why you can use it for nothing right now.
One person building it means some corners are rough and some things you expect are missing. If something is broken or confusing, telling me is the fastest way it gets fixed.
Found something broken or confusing? Make an account and there is a feedback box inside that comes straight to me.
