To score highly on the IELTS writing test, it is important to master basic English grammar rules. Sentences should begin with capital letters and words, not numbers. Additionally, sentences should not be started with "and". For completing sentences, the safest option is to always use a full stop, as question marks or exclamation points could be seen as aggressive. Following these grammar tips will help achieve at least a Band 7 score.

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http://www.thefreeschool.education/ielts-pages-1.html
IELTS Elementary English Language Grammar
You must be able to master these basic English language grammar tips to score a band 7
for IELTS writing.
Starting a sentence
Use a capital letter to start the sentence.
A not a. B not b. C not c, and so on.
Example: In my opinion, accounting is a difficult profession.
Always start a sentence with a word. Do not start a sentence with a number.
Example: Seventeen people in my family have travelled to Cambodia.

2. Avoid starting a sentence with the word ‘and’.
Example: Furthermore, I am also a graduate of Yale.
Completing a sentence
You must finish a sentence with one of these punctuation marks:
A question mark ?
An Exclamation mark !
A full stop .
For writing task 1 and writing task 2, it is safer to never use a question mark or an
exclamation mark.
Using an exclamation mark may come across to the reader as aggressive or sarcastic.
You should not ask the reader rhetorical questions. You earn higher credit for making
statements and observations.
The safest way to end a sentence is to always use a full stop.

3. Further reading:
http://www.thefreeschool.education/writing.html
http://www.thefreeschool.education/writing.html
The School’s IELTS writing grammar page: