Hello everyone again.

I wanted to write a formal letter about the ways of improving a site (not this site). But I'm not sure whether my letter is correct or not, because I have problems with any letters. This is my text:

Hello. I suppose that the levels here are not similar to the levels of English courses. For example, I have an advanced level here. But my really level is upper-intermediate. I think this system must be remade.

As well, a content for advanced look like the content for intermediate level.

I hope this system will be improved as soon as possible.

If I have mistakes, please, correct them. I want to be good in letter writing.

Thanks in advance.