Drink a little before 40 min of school?

I’m gonna drink today, but I have 40 minutes of school in almost 2 hours. I have been full on drunk at school many times. I don’t plan on that now, but I genuinely don’t wanna wait 3 hours to drink.

most of my alcohol is at home, but I brought a little bottle just in case.

I just think if I start drinking earlier(and enough to get a buzz) it’ll be better later