Proofreading 1877 Geography Quiz Questions

I have 1877 Geography quiz questions for a mobile app. I need them to be proofread / reformulated. I won't pretend this is going to be an easy task because almost every single question needs extensive rewriting. The difficulty ratings (1 - 70) mean: 1-10: pre-school (aged <=6) 11-20: lower primary (aged 7-9) 21-30: upper primary (aged 10-12) 31-40: lower secondary (aged 13-14) 41-50: upper secondary (aged 15-16) 51-60: college (aged 17-18) 61-70: university year 2 (aged 19-20) You should check to make sure: - there are no typos - the grammar is correct - the sentence structures are correct and succinct - the language expressions are not awkward - the question is clearly and correctly formed, eg. no ______ after a question mark - the difficulty rating at the bottom of each question is reasonable - the first answer option is the correct answer (check the internet if you suspect it is wrong, or think it is poorly presented) - the questions are varied and not repeated - there is only one correct answer and the four answer options are not unreasonably close *** IMPORTANT *** Do not use special non-standard characters. *** IMPORTANT *** Try to re-rate the difficulty of every question. *** IMPORTANT *** I also need you to remove boring questions. (Eg. Which country is the second/third/fourth largest producer of Silk in the world?) Such questions are hard to answer without referring to a reference. I expect you to remove about 100 such questions. You will have to turn on Tracker so that I will be able so see the changes made. Strict formatting rules must be observed as a text file will be read and parsed directly by the server. The Merits page in the game will bear your name. I believe it will take a person one week to complete the project if the person is to works full-time for it. You must complete the project by 13 Jan 2017.