I'm having difficulty with some essays: about weaknesses, unfairness, goals, non academic knowledge

There are so many essays for the Gates Millennium Scholarship and I'm so unsure about how to approach the questions. The ones I'm having difficulty with are Essay 2 in which you tell about your weaknesses, Essay 3 in which you explain a time something unfair happened to you, Essay 4 in which you tell about your goals (short term as well as long term) and Essay 7 when you tell about your any knowledge you have that is not academic. from gmsp.org

Essay 2: They are looking specifically for academic weaknesses, so express a time when you had trouble with a class / project / grade and what you did to overcome it. Be sincere and don't forget to answer the entire prompt. This is tough, though, because the prompt asks you 5 questions.

Essay 3: This could be any situation. Maybe a grade, or a group project, or discrimination. Remeber that if you have never had something of the like happen to you you can write about a time when you stood up for someone else. That's what i did.

Essay 4: This one is fairly straight forward. Just tell them what your plans are for the future. I talked about getting into college, funding it, and becoming a success full engineer.

Essay 7: Do you have any special talents or skills? That is what they are looking for. In my situation, i am writing about my ability to repair electronics, and my passion for photography.