I recommend you to try "English grammar in use" (Murphy, R.). It is a good book. I think that in comparison to others grammar books it is better one. One grammar explanation page and next one full of exercises.
This book consist of short and clear explanations with examples, interesting exercises.
1. Oxford English Grammar Course by Michael Swan and Catherine Walter
2. Practical English Usage by Michael Swan
Hi Pahola, these are the best books in my experience,
I have no idea how your grammar is, if so, you can take other's advice to concentrate more on grammar study. Alternatively, I would suggest you may focus more on news and article reading to polish your English. Here a link below is my recommendation to your English:
I read very often to enhance my English proficiency which is suggested by an Australian local
Good luck and if you wish, click me to practice with me.
