Yes. The free plan includes 5 practice tests per course. Full access is $19.99/mo per course.

What exams does Cognify cover?

Cognify covers AP Psychology, Digital SAT, AP Biology, and AP Statistics with practice tests, rubric-graded FRQs, and score prediction.

How does Cognify compare to Khan Academy?

Cognify focuses on exam-format practice with AI grading and score prediction. Khan Academy provides broad video instruction. Cognify is purpose-built for AP and SAT exam day performance.

How does Cognify compare to UWorld and Princeton Review?

UWorld and Princeton Review rely on static question banks that students exhaust after a few sessions. Cognify generates fresh questions on demand against the official College Board exam blueprint, so every practice test is unique. FRQs are graded point-by-point against AP rubrics with specific feedback on what you earned and missed.

How accurate is the AP score prediction?

Cognify maps your percentage correct to the public AP composite scoring buckets (1-5) using historical score distributions. The prediction improves as you take more practice tests. For the Digital SAT, scores map to the 400-1600 scale using official section score conversion tables.

Does Cognify cover AP FRQ practice?

Yes. Cognify provides rubric-graded FRQ practice for AP Psychology, AP Biology, and AP Statistics. Each response is scored criterion by criterion against the official AP rubric with specific written feedback explaining what you earned, what you missed, and how to improve.

Reliability and Validity

AP Psychology — Scientific Foundations

Overview

Test-retest reliability, inter-rater reliability, internal consistency. Content validity, criterion validity, construct validity. Why both matter.

Key Terms

reliability
validity
test-retest
inter-rater reliability
content validity
construct validity

Exam Tips

A test can be reliable but not valid (but not the reverse)
Practice identifying reliability and validity issues in scenarios

Common Mistakes to Avoid

Confusing reliability with validity
Thinking high reliability guarantees validity

Frequently Asked Questions

Can a test be reliable but not valid?

Yes. A bathroom scale that consistently reads 5 pounds too heavy is reliable (consistent) but not valid (not accurate). Validity requires reliability, but reliability does not guarantee validity.

Ready to practice Reliability and Validity?

AI-generated questions with instant feedback. Free to start.

Start Practicing Free

Reliability and Validity

AP Psychology — Scientific Foundations

Overview

Test-retest reliability, inter-rater reliability, internal consistency. Content validity, criterion validity, construct validity. Why both matter.

Key Terms

reliability
validity
test-retest
inter-rater reliability
content validity
construct validity

Exam Tips

A test can be reliable but not valid (but not the reverse)
Practice identifying reliability and validity issues in scenarios

Common Mistakes to Avoid

Confusing reliability with validity
Thinking high reliability guarantees validity

Frequently Asked Questions

Can a test be reliable but not valid?

Yes. A bathroom scale that consistently reads 5 pounds too heavy is reliable (consistent) but not valid (not accurate). Validity requires reliability, but reliability does not guarantee validity.

Ready to practice Reliability and Validity?

AI-generated questions with instant feedback. Free to start.

Start Practicing Free

Reliability and Validity

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Reliability and Validity?

Related Scientific Foundations Topics

Reliability and Validity

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Reliability and Validity?

Related Scientific Foundations Topics