Here's how we define skill levels.
Can read Hebrew with difficulty.
Knows most of the common words like לא, כי, and such.
Knows most of the prefixes and suffixes of words.
Knows that to translate, you often need to change the word order to make sense in English.
Are learning Chumash, Rashi, and just starting Mishnah.
Knows, and most likely practices, the basic rituals of Judaism.
If you were in a Hebrew Day School in North America, you'd most likely be in 2nd-5th grade. Obviously, there is a wide range there.
Everything basic, and:
Can read Hebrew pretty well.
Still need help getting the translation to make sense in English.
You're learning Mishnah, maybe starting Gemara, or working on some of the harder parts of Tanach.
You're starting to learning some of the Rishonim/Mikraot Gedolot on the Chumash.
If you were in a Hebrew Day School in North America, you're most likely in 4th-8th grade.
Everything intermediate and,
Are good at reading Chumash, but still working on working through Aramaic or Sefer Yeshayahu.
Mikraot Gedolot, Rishonim, and Acharonim are a regular part of your study.
You're learning Gemara with Rashi and Tosafot, the Malbim on Mishlei, Shulchan Aruch, or the like.
If you were in a Hebrew Day School in North America, you're most likely in 8th-12th grade.
Clearly, this is a pretty rough breakdown. I've seen kids reach the advanced skill level in 7th grade, and some kids still working on intermediate in 12th grade. I'm just going on what I've seen in the students of taught and talking to my friends about their kids and schools in their communities. But hopefully, this gives you a ballpark understanding of how we'll use these skills levels at Talmid.