Short answer
Education and practice improve knowledge and strategies; broad transfer and long-term score changes vary.
What affects it
Test quality, age, health, language, education, motivation, environment, and purpose all matter.
An average study effect cannot predict one person exactly.
Guidance
Use adequate sleep, quiet conditions, accommodations, and a suitable instrument.
For children, health, disability, or high-stakes decisions, consult a qualified professional.
COMMON QUESTIONS