If you are given the chance to revert something in the past.

I'd change the "Schlieffen Plan." Some people say that if Germany hadn't lost in "The Great War" World War II wouldn't have occurred. I mean, the Treaty of Versailles was basically an extreme impairment of the German State. I think everyone forgot Serbia started the war.

 

If I could go back, I'd definitely take music as a degree instead of listening to my parents. XD

 

maybe the time I purchased my 4th generation gaming rig..
and a week after 6th game came out..

 

As unfunny as it may sound i would probably try to graduate younger.

 

Something similar here, OP.
In my case I've had enough of my current school at the time, it was specialized in architecture and for that kind of schools if you aren't fully committed to it you're pretty much screwed. Then on the other hand there was mom talking about how I was gonna build her a house and whatnot.
So it was the typical what you want vs. not letting down people kind of problem.
Of course I would change that given the opportunity but you always do what you think it's best at the moment anyway, so no regrets

 

One thing that ability would be really good for is winning trivia game shows. Imagine if you didn't know the answer until after a question, and then you can revert back to the question and give the correct response. Then you could easily become a millionaire.

I think being able to revert something is a powerful tool.