Mistakes

 When I was in the last year of secondary school, Chemistry was easy for me, the most part of the time, but, one day something happened. We was going to have a test, and I was ready like always. The test had a part of concepts and the other part of some exercises, stoichiometry if I remember correctly, and well, the test started and our teacher wrote some formulas in the blackboard for helping us, just for a few minutes. The time had finished and I was happy because I felt that I had completed the most part of the questions right. 

 The day that the teacher gave us back our tests, she said that she was going to let us look it first, for look the points, if all was in order, and then she was gonna call us in list order for put the mark in the book of class, or correct if it was necessary. I was nervous but expecting the best, and then, she looked at me and said sadly "what happened?". I had obtained a red mark, a 3 and something, I had a few tenths for before homework, and she also knew that I always put attention and completed the homework, so she puts me a 4.  The thing that happened was that I got confused for one sign in the formula, and that make that all the development and results of the exercises was wrong. After that, Chemistry got hard for the rest of the year for me.

 I always remember that day, and I said that it couldn't happened ever again. And then, I got in the University. Test of introduction to calculus, and I was ready for the most part, except trigonometry, but in that moment it didn't care to me. I got out of the room, I was sure that in the part of "potential and exponential functions" and "limits", was almost all right. But, surprise, the first part was right, but, here we go again, in the limits part I got confused by a sign and, instead of adding, I subtracted, and with that all the rest go bad too.

 Don't be like me, if there's time to go slowly, or for check that is all right, do it, not matter the nerves, or the desire to just finish and leave. And this doesn't go necessarily for things like this, if you have time to do something that you really want but don't do just for excuses, think it again, it can make an important change.