OVERALL GRADE: 3 ; too many grammar mistakes.
FEEDBACK/"FIXES":
Hook: Change it to: "Breakfast, anyone? How about more sleep and better grades? These seem appealing, right? These are just a few benefits of school convening later in the day."
Claim/Thesis: Change it to: "The school day should begin at 9:45 AM because it would allow students additional time to prepare for their school day; they would be better rested, perform better, and engage more in physical activities."
Evidence/Reasoning #1: Change it to: "After all, students' brains are still asleep when it's early in the morning. Schools that start at 9:00 AM or later allow students the opportunity to get the recommended amount of sleep [8.5 - 9.5 hours.]"
Okay I have to go now but I hope what I provided helps.