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Hours to Go from a C to an A

Closing a 12-concept mastery gap

*Remediation model: 12 concepts (20% of 60-concept course) to close C→A gap. Based on 120-hour Carnegie unit. Human tutor efficiency from Bloom 1984 (2σ effect). AI tutoring from VanLehn 2011 meta-analysis. Relearning 50% faster than initial learning (Ebbinghaus). Hybrid: AI handles 75% easy concepts, human tutor focuses on 25% hard concepts. View full methodology

School Grades: Time-to-Mastery Model

How we calculated hours to go from a C to an A

Input Value Source
Course length 120 hours Carnegie Unit standard
Concepts per course 60 concepts Industry standard
Mastery gap (C to A) 20% = 12 concepts Grade band analysis
Relearning factor 0.5x (50% faster) Ebbinghaus (1885)
Human tutor effect 2 sigma (98th %ile) Bloom (1984)
AI/ITS effect size 0.76 sigma VanLehn (2011)

Results by Method

Method Hours Speedup
Video Course (baseline) 46.8h 1.0x
Group Tutoring 27.0h 1.7x
Grassroot 8.2h 5.7x
Human Tutor 6.0h 7.8x
Grassroot + Tutor 4.5h 10.4x

Hybrid model: AI handles 75% of concepts (easier ones), human tutor focuses on 25% (hardest concepts requiring nuanced explanation).

SAT Prep: Time-to-Target Model

How we calculated hours to go from 1250 to 1400+

Input Value Source
Target point gain 150 points 1250 to 1400
Points per pattern ~8 points SAT structure analysis
Weak patterns to fix 19 patterns 150 / 8 = 19
Base prep time 80 hours College Board
AI diagnostic accuracy 0.85 VanLehn (2011)
Deliberate practice effect 2-3x efficiency Ericsson (1993)

Results by Method

Method Hours Speedup
Self-Study (baseline) 104.6h 1.0x
Group Prep Class 87.0h 1.2x
Grassroot 48.8h 2.1x
Private Coach 33.2h 3.2x
Grassroot + Coach 29.4h 3.6x

Hybrid model: AI handles diagnosis + 70% of patterns (easier ones), coach focuses on 30% hardest patterns + test-taking strategy and pacing.

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