日本語検定の二級に受かった。

。

I passed level 2 of the Japanese Language Proficiency Test.

Literal

Japanese-language test [possessive-の] level-2 [to-に] passed.

日本語検定 ('Japanese language test') — the sentence likely refers to the JLPT (日本語能力試験), though the short form 日本語検定 is sometimes used loosely. 二級に受かった uses 受かる ('to pass an exam') — the intransitive form that takes に. A milestone sentence that many Japanese learners can relate to directly.