Not to be a dillsner, but...
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One thing that no one knows, or at least ever does:
On a PAT attempt that is unsuccessful, the defense has the option of taking a kick off or the result of the play. For example, if A&M blocked the PAT, and returned it to the end zone, it would be 2 points and they would receive the kick off, but if the defender, realizing a possible +EV opportunity (depends on the strength of your offense), stepped out of bounds at the Texas 1 yard line, they would be given the option of taking the ball at the Texas 1 with First and Goal to go, or having Texas kick off. No one knows this.
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NCAA Football Rulebook, Rule 8-3, Article 6:
"After a try, the ball shall be put in play by a kickoff or at the succeeding spot in extra periods. The team scoring the six-point touchdown shall kick off."
Rulebook link
Nothing about taking the ball at the result of the try.
Also, the free kick at the end of the half is only a rule in the NFL. It was placed there 5 years or so ago, and nobody seems to know why. It's not the rule in college ball.
Drop-kicking is also not worth any extra points. I think it might be in the Arena League and the CFL, but not in the NFL or NCAA.
I have no idea what the rules are for high school ball these days, so you may be right about that.