Anyone got any books or courses, they recommend?
I got mathacademy and two books to brush up my math skills to prepare for calculus
"Writing Essay" skills and not "essay writing" skills

?
That first sentence did not need a comma, as it was not a break in thought.
Punctuation is missing in the second sentence.
The second sentence had no relevance to the topic, so cohesion and flow is lacking.
In short: draft better, fakkit

C-