@charania203,
I really don't have any tips as such but you can follow a few steps.
1) instead of writing the essays just read a lot of sample essays from ieltspodcast.com, ieltsanswers.com, ieltsliz.com
2) create an idea bank for the most common topics along with 10-15 topic vocabulary.
3) get your essays checked by anyone who is an expert in the language or you can use the service of former examiner Mike...his website is ieltsanswers.com
4)last but not the least try to follow the common structure.
All the best