Now test preparation is a synonym for examination classes, test, examination.

备考是考试课的同义词，测试是考试的同义词。

You probably got alert letters last spring saying someone in your kid's class tested positive, and if your kid was a close contact get your child tested too.

去年春天你可能收到警告信，说你孩子班上有人检测呈阳性，如果你的孩子是密切接触者，也让你的孩子接受检测。