What Would You Do If You Visit The Past

Would I visit the past if I could? Yes, I will.If I visit my past. What would I do if I really visit the past? I would like to change my answers on the test that I took since elementary school. It won't create a paradox in the future because it is just changing few letters on my transcript. Also, I could have rob the bank, steal all the money, and secure the money in my house. The fact is, I would like to visit my grandmother and grandfather of my dad. In order to visit them without scaring them, I won't tell them that I am their great granddaughter. However, my main target is to change every mistakes I have make; the mistakes change anything in the future, maybe a little, but won't change my personality. Since I could have changed my past, I would also be happy to change other people's life. For those people I don't like, I would go back to the past and ruin their life; for the people that I like (boys, friends), I would just slightly "remind" him/her that I am the one who will always be there for them if they got problems.