As an IELTS Writing teacher, I understand that mastering writing can sometimes be a challenge. Here are some concise yet effective tips to improve your writing skills:

Know the Task Types: Understand the differences between Task 1 and Task 2. Task 1 deals with data description, while Task 2 involves essays on various topics.

Practice Regularly: Dedicate time to writing every day or a few times a week. Consistent practice sharpens your skills.

Vocabulary Matters: Expand your vocabulary to avoid repetition. Use synonyms and incorporate advanced words and expressions.

Grammar and Punctuation: Good grammar is essential. Review grammar rules and pay attention to punctuation for clear and precise writing.

Plan Your Essays: Spend a few minutes planning your essay. Create an outline to organize your thoughts effectively.

Time Management: Stick to the time limits. Task 1: 20 minutes, Task 2: 40 minutes. Allocate time for editing. Note your times down as you practice

Seek Feedback: Get feedback from teachers or peers to identify and rectify your mistakes.

Read Widely: Read diverse texts to understand various writing styles and expand your vocabulary.
Consider classes that encourage you to read and understand news articles or even TED talks. I offer these classes as well and these could be useful in familiarising yourself with diverse texts. 

Stay On Topic: Always address the question or topic directly.

Practice Time Management: On the exam day, manage your time wisely by starting with your stronger section and being mindful of the clock.

Incorporate these tips into your preparation, and you'll be on your way to IELTS Writing success. Good luck!