Being regarded as encoding / productive skills, speaking and writing band scores develop if and only if you expand your knowledge of words . The reason is that words are carriers of meanings and ideas and are the means by which you can handle speaking and writing skills dynamics effectively. Therefore, as American writer Robert Louis Stevenson states, be a rigorous reader, but at the same time , act as a diligent ape by writing the words and chunks of language that are the best options for expressing ideas. Then, by memorizing them, imitate them in similar contexts.
Writing skills of IELTS has 2 types, there are writing part 1 and writing part 2 and for the writing part 1, we need to pay attention how to start describing the pie, diagram, or graph (at least 150 words) and writing part 2 (at least 250 words without any plagiarism, it is a topic given. Writing part 1 is normally explained one by one and on the spot and it totally describes regarding its conditions without personal opinion (pay attention for the grammar used, such as "past tense'. However, writing part 2 is how to make your narration based on the topic with the following conditions, such as (1) introduction, (2) main idea/content, supporting idea with strong reasons, (3) conclusion. what we need is to find more synonyms to enrich your vocabulary because plagiarism will not be accounted for the band score, for examples: (get : obtain/ bring : convey, etc).
The 3 sessions of speaking IELTS are introduction, a topic give on card (in two minutes explanation), and conclusion based on the question from the examiner of IELTS, which the length of time for speaking test is approximately 1-15 minutes for whole. Accordingly, my experiences in following the test, you need to answer the right question for the right answer as well, in the first session, please just answer and give the information based on the question clearly not too long with more additional statements and you recommend to use the word "well, yes " before answering the question itself. Second, explain the topic appropriately and clearly with more confidence and make sure that you have a clear pronunciation in 2 minutes. and the third, it is similar with the first session.
Do you mean re-mark? As in ask them to mark the paper again? I think you should try to talk to an examiner/instructor and find out how they mark your paper, and then learn to emulate what they are looking for.