SAT Prep — Free & Adaptive
Stop guessing what to study. Start drilling what matters.
Sparse Halo's SAT mode gives you a 20-question diagnostic, targeted practice by section and skill band, three specialized AI advisors, and a live score estimate that sharpens with every session. Not a generic chatbot — a dedicated practice workspace built for the Digital SAT.
Free to use. Sign in to save progress and unlock your score dashboard.
How it works
Four stages. One clear workflow.
SAT mode separates placement, practice, coaching, and tracking so each stage stays focused and each tool does its job well.
Take the diagnostic
20 balanced questions across Math and Reading/Writing establish your first estimate range in under 15 minutes.
Drill your weak spots
Launch practice sets by section, subtopic, and difficulty band. No more waiting for a weak topic to appear in a full-length test.
Get advisor guidance
Three AI advisors — Question Tutor, Strategy Coach, and Study Planner — give you the right kind of help for the right moment.
Track your growth
The Score Catalyst dashboard turns practice data into momentum trends, mastery signals, and a live score estimate that tightens with every session.
Inside the workspace
Everything you need. Nothing you don't.
AI-generated questions
Every question is generated by a specialized AI engine and then validated by a second AI model for skill alignment, answer correctness, and distractor quality.
Math & Reading/Writing
Full coverage of both Digital SAT sections. Drill linear equations, data analysis, grammar conventions, reading comprehension, and more.
Three difficulty bands
Questions calibrated to 600-level, 700-level, and 750+ complexity. Each band maps to specific reasoning depth and distractor sophistication.
Instant explanations
See the correct answer, the reasoning behind it, why each distractor fails, and strategy tips — immediately after answering.
Transparent scoring
The score estimate shows a range with a confidence label. Early signals don't pretend to be precise. The range tightens as you provide more evidence.
Downloadable methodology
The full scoring-methodology paper is published and downloadable. No black boxes — see exactly how estimates are calculated.
Three AI advisor lanes
Different kinds of help. Sharp, not blended.
Most SAT tools dump tutoring, strategy advice, and study planning into one generic chatbot. We keep them separate so the help actually fits your question.
Question Tutor
Understand the problem
Get step-by-step explanations of individual SAT problems. Ask follow-ups, explore why distractors are wrong, and build conceptual understanding on every question.
Strategy Coach
Sharpen your approach
Focus on timing, elimination, trap-answer awareness, and solving approach. The coach helps you work smarter under test conditions, not just learn the content.
Study Planner
Know what to do next
Turns your score range, target, and weak topics into a concrete study recommendation. Stops the "what should I study?" loop before it starts.
Who it's for
Built for students who want focused practice, not busywork.
Self-study students
Students who want focused, efficient practice without committing to an expensive prep course or sitting through full-length tests every session.
Busy juniors and seniors
High schoolers balancing classes, extracurriculars, and applications who need to maximize study efficiency in short sessions.
Parents & counselors
Families and counselors looking for a free, transparent tool that shows how scoring estimates work, with a downloadable methodology paper.
Score-band specializers
Students who know their weaknesses and want to drill a specific difficulty band (600, 700, or 750+) in a specific section, not a generic test.
Transparent by design
The scoring methodology is published, not hidden.
Most SAT tools show a score without explaining how it was calculated. Sparse Halo publishes the complete scoring-methodology paper so students, parents, and counselors can evaluate the estimate on their own terms.
The paper covers weighted accuracy calculations, difficulty-band calibration, confidence-level assignments, and how the composite range converges with additional practice evidence.
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Score bands
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Sections
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Confidence levels
These are practice-based estimates, not official SAT scores. Actual test-day scores can vary.
Common questions
Frequently asked questions
Yes. The SAT diagnostic, practice sets, AI advisors, and Score Catalyst dashboard are all free. Sign in to save your progress and track growth across sessions.
No. These are AI-generated practice questions designed to match the format, tone, and skill taxonomy of the Digital SAT. They are not released by College Board.
The estimate is practice-based, not predictive. It shows a score range with a confidence label that tightens as you complete more calibrated work. It is a practical directional signal, not an official SAT score. The full methodology is published and downloadable.
Questions are calibrated to three score bands: 600-level, 700-level, and 750+ level. Each band maps to specific complexity, distractor quality, and reasoning depth.
The diagnostic is 20 questions — 10 Math and 10 Reading/Writing — spread across difficulty bands. It establishes your first estimate range and identifies your initial weak spots. It takes about 10-15 minutes.
Three specialized AI advisors: Question Tutor explains specific problems, Strategy Coach focuses on timing and test-taking approach, and Study Planner turns your range and weak spots into actionable next steps. Each has a distinct role — they don't blend together.
Not for the workspace itself. You can take the diagnostic and practice without an account. Sign in to save your progress to the cloud, access your Score Catalyst dashboard, and track growth across sessions.
Three key differences: (1) every question is freshly generated by AI, so you never run out of novel problems, (2) practice is organized around your specific weak section, subtopic, and difficulty band, and (3) the advisor system keeps tutoring, strategy, and planning separate instead of mixing them in one interface.
Your score range is waiting.
Take the 20-question diagnostic, see where you stand, and start drilling the exact skills that will move your score.