Because listening and reading are subjective questions, you can get 0.5 points. Generally speaking, there are 40-42 questions in listening and reading. IELTS scores are calculated according to the correct number of candidates doing the questions correctly. If you do 18-24 correctly, you can get 5.0 (among them, the score may be fine-tuned according to the depth of the question, and then there may be a fluctuation of 0.5), and if you do 26 correctly, you can get 6.0.
Writing and oral examination are subjective questions, and the scoring standard is based on the examiner's subjective impression. These two terms do not have 0.5, only integers. Generally speaking, in the process of writing, as long as the main points to be expounded are clearly explained, the paragraphs are clear and the levels are clear, you can generally get 6.0. In the oral test, as long as there is no communication interruption, you can also get 6.0 by expanding the examiner's questions as much as possible.