The term "you" would be considered
what part of speech in the sentence?
Make sure you get a lot of sleep before
the scary, standardized test.

Noun

Explanation:

The word "you" would be used as a noun in this sentence. Because the verb in this sentence would be the word "get", ask yourself who the verb is applied to. It's a linking verb, but a verb nonetheless, and it is applied to the word "you". The main parts of speech are noun, pronoun, adjective, determiner, verb, adverb, preposition, conjunction, and interjection.

you should go do that

explanation:

by our hard work

for that