This is the 3673rd most frequent Russian word.
тесты
Tests.
This sentence uses "тесты" to refer to academic tests or examinations that will be taken in the context of studying math.
Я готовлюсь к завтрашним тестам по математике.
I am preparing for tomorrow's math tests.
Here, "тесты" refers to tests or checks in a software development context to ensure quality.
Программа должна пройти все тесты перед выпуском.
The program must pass all tests before release.
In this example, "тесты" refers to medical tests or examinations conducted to check one's health.