For the listening and reading test, one key to note that is very useful is key words and thinking of synonyms for those key words. In the 30 sec given in the listening to study the questions, quickly underline these key words and think of possible synonyms (not enough time though) but this thinking comes as you listen for possible synonyms as the tape may help you. Make sure also that the number of words do not exceed. At this point, we may be tempted to use just a word, but be careful because you are listening for words that completes the sentence accurately and grammatically. The most difficult is the MCQ where options are given. key words will also help you and try to immediately eliminate options while you listen (don't panic).
In the reading test, the most challenging is the Y, N NG and T, F, NG questions. For the true and yes questions, mark out the key words, use this to match the passage, using this key words and matching, is the meaning same? if yes, then its true or yes, if not same, is it the opposite?, then its false or No, but if it is not same and not opposite, then its not given.
I found this course very useful;
https://www.edx.org/course/ielts-academic-test-preparation-uqx-ieltsx-1 for future test takers you will find it intersting. Though it is academic, the pattern is pretty much same except the writing task 1.