Thanks for A2A. I would share my own practices for IELTS preparation.
Listening: Listen to DW, BBC, CNN, and documentaries of National Geographic and HBO. Further, try to watch good informative English movies. The important part is trying to discern and comprehend the accent and the idea that is conveyed. Practice this for at least a month and you would certainly see a difference.
One side note: While practicing and also on actual day, try not to divert your attention on any other issue except the voice of the narrator, and listen very very carefully, because just a diversion of 1 second can cost you 2 blanks that are your two marks leading your score from lets say 7.5 to a 7. A lot of practice would make you understand what I am trying to convey.
Reading: Try to read good informative English articles from the newspapers such as The New York Times, The New Yorker, and The Atlantic, etc.. The important part in Reading is to try to get the big picture of the passage; the overall idea and import of the article. Do not go for the verbiage and wordy lines, instead, do focus on the critical details the author intends to convey. Two to three articles a day are enough. While practicing from the IELTS British Council books and also on test day, read the first paragraph, then move on to the question section and read them carefully, you would be able to answer at least one of the given questions. Now repeat the same process; read the second paragraph and move on to the question section. Again you would be able to answer a couple of questions. Doing this would save a lot of your time, trust me.
One side note: There are always a few questions in the Reading section, which are tough with seriously misleading answers. You have to carefully detect the significant details in both the question and passage in order to answer such questions. Doing a lot of practice with such beguiling passages/questions would considerably help you attain perfection.
Writing: Writing is the next step to do after reading a passage. Try to write a summary of the article you just read. Pick up the main idea of all the passages which are comprising the whole article. In IELTS if you have to write for or against a given statement, first of all, do your own contemplation and brainstorming in two to three minutes. Then enumerate the pros and cons of your topic on a rough paper. Doing this will clarify yourself either you have to write for, or against the given topic. Further, each of your stated pro or con will help you decide the number of paragraphs in your essay; four pros contribute to four paragraphs of your essay.
One side note: DO NOT make spelling and grammatical mistakes, and try to write simple sentences with normal vocabulary.
Speaking: As the word itself says - you can only improve your speaking skills by speaking the English language frequently. It might feel bizarre to you but try to talk to yourself in a secluded room. Moreover, try to solve the speaking lessons in the IELTS British Council books and record your voice. Then, listen to the recording, and try to find out the subtle mistakes in your speaking. Also, in the beginning, do try to rectify the grammatical mistakes and use simple sentences.
FINAL NOTE: You must solve all the exercises of listening, speaking, reading, and writing in the IELTS British Council books. The books are free and available on the internet. Try to solve two to three tests a day. And remember, Listening and Reading are the only two sections which are easier to obtain marks and accordingly boost your overall band.
I hope it helps and best of luck.