请英语好的朋友帮助纠正一下翻译错误：“我整理了一下以前做过的quiz，并且为了方便以及，。。。”

其实整体没什么问题。需要简化一下：
I collected the quiz I did before, and simplified the answers for better memorization. But still, there are some questions which I have no answer. Could you please help check whether the answers are correct if you have time? Thanks.

have collected=> collected

we have already done=> had

I simplify the answer for memorize it. => ......+easily

there have some questions I don't know how to answer. => there are some questions that i ....
if have time. => when you are free
Many thanks.=> thank you very much

I have adjusted done before quizzes, and in order to facilitate and simplify the answer, at the same time, some questions I don't know how to answer. If you have time, will be able to help me to check my answer is correct. thank you 是和多大年纪的人聊的 你没说 这个是最普通的