“Haste makes waste” which is an old saying accepted almost by [almost] everyone. Some people are prone to do the tasks as quickly as they can but then they realize that everything got wrong. From my point of view, we should not do things precipitately but instead we should act carefully.
For a start, haste makes us lose our attention.{"lose our attention" is odd - maybe "haste can prevent us from paying proper attention"} The main reason is that we only think about consequences of our aim when we act quickly.{do you mean you don't think about the consequences when you act quickly?} So eventually it may result in unpleasant and dangerous events. For instance, researchers have recently shown that about ninety[-]six percent of car accidents are caused by fast driving. Sometimes drivers think that they may get faster to their desirable place [faster] but this belief may pull them into a grave rather than [to] their location.[destination] {this is a good sentence, but we would more commonly say "push them into a grave" - pull sounds like there is a corpse or something pulling them in - spooky!}
Secondly, people are no[t] able to effectively use their mind[s ] when they conduct tasks faster. In other words, our brain cannot implement some commands in a very short time. For example, I had a major English test three months ago [in] which I did not do very well on it. There were twenty questions and twenty minutes to finish. So I decided to write faster [as fast] as I could. After accomplishing[completing the test] I was feeling as if I had written {good choice and use of verb tense here!} very well but when I received my grade I was shocked. There were also many questions that I missed since I had not seen them. Concisely, haste makes the things in opposite. {this is unclear to me}
Last but not least, haste can even pull us into{"push us over" makes more sense} a precipice. {comma} Since sometimes it is a big risk to make quick decisions. For