At what level of English-language proficiency is Marco categorized if he demonstrates comparable writing skills to his grade-level peers?

Marco is categorized at the Advanced-High level of English-language proficiency because he demonstrates writing skills that are comparable to his grade-level peers. This level indicates that he can effectively use the language in various contexts and can express complex ideas in a clear and coherent manner, similar to native speakers at the same educational level. At the Advanced-High level, students typically show a strong command of academic vocabulary and structures, which allows them to perform well in writing tasks without significant difficulty.

The distinction of Advanced-High implies not only proficiency in basic writing skills but also the ability to engage with more nuanced language and complex sentence structures, which is essential for academic success. Being able to write at this level suggests that Marco has likely surpassed the challenges faced by learners at lower proficiency levels, such as Beginning or Intermediate, where writing skills would typically be less developed and would not match those of grade-level peers.