I passed IELTS last year. Got 8.0 in Reading and 7.0 in Writing. Got C1 in total. I used Oxford guide and just practiced exercises over and over again. Once you get used to the IELTS format and learn some useful vocabulary - you struggle less.
How much time do you have before your exam?
You can message me, I'll try to help.

My level is c1 advanced 
You are welcome 
You can send me an add request or a message if you are interested