Hi Marion. 

Your original text does not contain many grammar mistakes, but a lot of stylistic and phrase errors (so that at times it is not very clear what you meant), so I took the liberty of editing your text in order to convey, what I believe you meant to convey. Please note that in the text below much of my personal written expression style will shine through, meaning it is by no means a guideline, it is - just as stated above - a reformulation of your essay that does away with the previous errors. 

I hope it helps

P.S You are also welcome to book a trial English lesson with me, should you ever feel the need to :)

I have been interested in crop improvement for many years and I've set up my studies such, that I will become a plant breeder. I am currently pursuing a bachelor’s degree in biology and agricultural sciences at "Grandes écoles”, having already passed the entrance examination.  I can really be passionate about my occupation, provided I enjoy it. I admit to being flawed, but so are we all. Criticism is not something I take well right away, but I do eventually take it into consideration and change my ways. In the same vein, I do not particularly enjoy working in a team, due to unpleasant experiences of doing so during my studies. In the light of this I chose to work together with people of very different backgrounds and approaches, thus I understood how helpful exchange experiences can be. <o:p></o:p>

On another note, I have been playing rugby since I was four years old, which has helped me build a capacity for teamwork, as every match is a collective effort. I play as a “prop”, which entails having specific functions on the pitch. <o:p></o:p>

Furthermore, I am no stranger to working under pressure. Having carried through numerous projects during my studies has taught me the value of organization and showed me that pressure can also be a great motivator. I would also like to draw attention to my activity as an administrative employee for the wheat campaign. In doing so my duties were receiving the farmers who were selling wheat and overseeing the stocking process. <o:p></o:p>

On yet another note, I enjoy writing novels. In such an endeavor I was pleased to write a short story for the Crous competition, on the topic of revolution. The jury’s decision on my essay is still outstanding, since the deadline was as recently as the 15^th of March. I am mentioning the above, given the important role the ability to write will have in publishing articles during my career.  <o:p></o:p>

Thank you for reading my letter. 

New trousers

I hope it helps. Good job!