Stay those hands of time please

Ever wanted to reboot your life?
Like, you take all the information you have in you now, and go back to a certain point in time in your life and live it all over again.
What would you have changed?
Would you have studied harder, knowing now how important that academic qualifications are in your life?
Would you have behaved differently, to ensure you were popular socially?
Would you have studied your mother tongue harder, as you realise only now how useful it is?
Would you have not played so much, and instead used the time to learn a skill or do something that would give tangible results, so as to reap the benefits later in life?
Would you not say things that you would have said in a fit of anger or frustration?
Would you still have worried excessively over things that really won't matter much in the future ie test results?
Would you cherish your close friends more, knowing that they're the ones who will be with you for the next few years?
Would you want to commit the same big mistakes that made inerasable marks on your consciousness which will forever affect your decision making?
Personally, although they are many a time when I indulge in many "If-only-I-knew-then-what-I-know-now" moments, especially when my mind wanders back to unpleasant memories stashed away at the back of the mind. But asking ourselves these questions are quite pointless, as it is through living through the years that we acquire this knowledge to feel that we could have made a better decision. Therefore, it's the perennial chicken and egg situation, there must one before there can be the other.
I think the closest possible avenue to reboot your life would to do what I'll be doing, which is to move to a new country, meet new people, live in a new room, basically to start from scratch.
For all my bravado, I hope I'm prepared.