Question 1
A sample of double-stranded DNA from a bacterium is 22% adenine. What percentage of its bases are cytosine?
AP Biology pass rate and score distribution
In May 2025, 70.4% of AP Biology students scored 3 or higher. The mean score was 3.24 out of 5.
| Students in May 2025 | 287,232 |
|---|---|
| Scored 3 or higher | 70.4% |
| Scored 5 | 18.9% |
| Mean score | 3.24 |
The May 2025 distribution
- A 5: 18.9% (54,186 students)
- A 4: 24.1% (69,276 students)
- A 3: 27.4% (78,700 students)
- A 2: 21.0% (60,445 students)
- A 1: 8.6% (24,625 students)
What counts as passing
College Board does not call any score a pass. Many US colleges grant credit or advanced placement for scores of 3 and above, and each college decides which scores it accepts. Check the colleges on your list.
How a score is made
Section I and Section II are each half of a composite score, which College Board converts to the 1 to 5 scale so that a 3 one year means the same as a 3 the year before. Our practice exams report questions right and points earned, never an AP score.
Try 2 questions
Question 2
A drug stops vesicles from carrying proteins from the endoplasmic reticulum to the Golgi complex. Cells that normally secrete a protein hormone are treated with the drug. Which result is most likely?
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Questions people ask
What is the AP Biology pass rate?
70.4% of students scored 3 or higher in May 2025, the score many US colleges accept for credit.
What is the average AP Biology score?
3.24 in May 2025.
How many students take AP Biology?
287,232 students took the AP Biology exam in May 2025.