Am I using comparatives and superlatives correctly in these sentences?

•When I started school, my writing skills were limited, now I have more knowledge on how to write correctly.
•I have not had the easiest time understanding certain materials.
•It seemed to me that I was the most unpracticed in writing then the other classmates.
•Since, Raul is the best in class when it comes to writing; she helps me with my homework.
•I have learned that taking notes help me understand the material better than just listening to the professor.
•Learning how to use commas was the worst of all the punctuations.
•In class, I have learned the proper way to use punctuation, sentence structure, and writing a paragraph, which has made me a smarter writer.
•I will try to use more intelligent wording when writing.

Yes, you've used comparatives and superlatives correctly.

However, you've made some other errors.

•When I started school, my writing skills were limited, now I have more knowledge on how to write correctly.
You need a semi-colon, not a comma, after "limited.

•It seemed to me that I was the most unpracticed in writing then the other classmates.
You need "than," not "then."

•Since, Raul is the best in class when it comes to writing; she helps me with my homework.
No comma after "since."
A comma, not a semi-colon, is needed after "writing."

Here is a breakdown of the sentences and an analysis of their usage of comparatives and superlatives:

1. "When I started school, my writing skills were limited, now I have more knowledge on how to write correctly."
This sentence is correct. It uses the comparative form "more" to show an increase in knowledge compared to the previous limited skills.

2. "I have not had the easiest time understanding certain materials."
This sentence is correct. It uses the superlative form "easiest" to describe the most difficult time in understanding certain materials.

3. "It seemed to me that I was the most unpracticed in writing then the other classmates."
This sentence is incorrect. It should say "I was the least practiced in writing than the other classmates." The superlative form "least" should be used to compare the level of practice in writing.

4. "Since, Raul is the best in class when it comes to writing; she helps me with my homework."
This sentence is correct. It uses the superlative form "best" to describe Raul as the highest level of proficiency in writing.

5. "I have learned that taking notes help me understand the material better than just listening to the professor."
This sentence is incorrect. It should say "taking notes helps me understand the material better." The verb "helps" should agree with the singular subject "taking notes."

6. "Learning how to use commas was the worst of all the punctuations."
This sentence is correct. It uses the superlative form "worst" to compare the difficulty of learning different punctuations.

7. "In class, I have learned the proper way to use punctuation, sentence structure, and writing a paragraph, which has made me a smarter writer."
This sentence is correct. It does not use comparatives or superlatives; instead, it describes learning different topics without making any comparisons.

8. "I will try to use more intelligent wording when writing."
This sentence is correct. It uses the comparative form "more" to suggest an increase in the use of intelligent wording.