Sure, here are some common terms used in the US school system and their meanings:

Terms used to describe in what year a student is in:

1. Freshman: A freshman is a first-year student in high school or college.

2. Sophomore: A sophomore is a second-year student in high school or college.

3. Junior: A junior is a third-year student in high school or college.

4. Senior: A senior is a fourth-year student in high school or college.

Terms used to describe different levels of classes:

1. Elective: An elective is a class that a student chooses to take, rather than one that is required for graduation. Elective classes can vary widely and may include subjects such as art, music, or a foreign language.

2. Core classes: Core classes are classes that are required for graduation, such as English, math, science, and social studies.

3. AP classes: AP stands for Advanced Placement. AP classes are college-level courses offered in high school that can earn students college credit if they pass an exam at the end of the course.

Additional terms used for describing tests and grades:

1. SAT/ACT: The SAT and ACT are standardized tests used by colleges and universities to evaluate a student's performance.

2. GPA: GPA stands for Grade Point Average. It's a numerical representation of a student's academic performance, calculated by averaging all of their grades.

I hope this helps! Let me know if you have any other questions.
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