Prepare for IELTS on your own. Every part of each test has three steps: learn the key vocabulary, practise with instant checking and a review of every trap, then do the part in real exam conditions and see your band. Tests 1–4 are based on Cambridge IELTS 21.
Do the steps of each part in order – the next one opens when you reach 80%. You can repeat any part as many times as you like.