请问这是什么意思?我写了个英语句子,这是网友给我的建议（我看不太懂）,如下：
I suppose your sentence should be:
It's (to) make you improve your knowledge in a little extent for you to read this book.
In oral English, the preposition "to" sometimes is omitted by people in the above case. Actually I don't think there is any passive voice present in your sentence. And I suppose the "It's" is short for "It is". It is to do sth.