There is no single "correct" sequence of which standardized tests to take or when to take them. Although I can help you decide from a math perspective, there are many other considerations. You should discuss your decision with your parents and guidance counselor. However, to give you a rough idea, below is a timeline of when tests are offered. You should not take the SAT II subject tests without speaking to your teacher, guidance counselor, and parents.
| Grade | Months offered | Test |
| 9 | May, June | SAT II subject test (e.g., Biology) |
| 10 | Oct | PSAT, PLAN |
| May, June | SAT II subject test (e.g., Chemistry) | |
| 11 | Oct | PSAT |
| Dec, Feb, Apr, June | ACT | |
| Jan, Mar, May, June | SAT | |
| May, June | SAT II subject test (e.g., Physics) | |
| 12 | Sep, Oct, Dec | ACT |
| Oct, Nov, Dec | SAT |
