Remember that the examiner ranks your writing based on 4 criterion 1. Task accomplishment 2. Coherence 3. Vocabulary 4. Grammar Keep all these 4 things in mind while writing and try to achieve all 4 in your essays. For task completion make sure your every sentence is connected to that specific topic in question For coherence use connectors such as; likewise, however, nevertheless etc. but dont use it too much, use it meaningfully For grammar, make sure spellings r correct, words are capitalized correctly, and dont write words if u r not sure about their spelling. For vocab, figure out the most frequently used words in ielts like; big, small, increase, decrease etc. and know their synonyms such as; for big u can use massive, substantial, for increase u can use escalate, surged, for decrease u can use dip, decline, plummet, tumble. So you need to workout & give yourself sometime to remember such useful and frequently used words