I can help you with that!

I'd say you should start by determining the band score and the module you need and then get an estimate of a score for each part so that you have an idea where you are. That is, if you need an overall band score 6 and you get 5 or 5.5 that means you need to keep practicing IELTS-style tests, but if you need 6 and only get 4-4.5 that is a sign that you need to first improve your general English.

You need to find out why you are getting the scores you are getting and then focus on improving in the skills that will most efficiently improve your overall band scores.

My biggest suggestion would be: familiarize yourself with the test. Get hold of some samples of the test and go through them. I would recommend that you get some practice with a native speaker who can give you feedback on your speaking and writing. My other suggestion is learn synonyms, in the listening and reading the speaker/writer often uses synonyms to the vocabulary in the questions. In your writing and speaking you'll get a higher score in terms of lexical range if you can paraphrase and avoid commonly/over-used vocabulary.