there's traditionally four years in high school; the first day is just the initial "taste"
Nope, your'e done. Never look back.
Seriously though, never just anything by the first day.
But most of high school can be repeating the same day over and over, so make the most of it and remember that there is a lot more to life than that.
There's the second day...the third...the fourth...and so on, till about 4 years worth have passed, not including the days spent with high school associated people when high school is not in session...
The 179 days that comes after it, as well as the weekends you spend studying :V
Yep. The last day. And then you understand how important all the days really were.