Before applying for another test, take a moment to consider your options. Your score is unlikely to increase unless you make a significant effort to improve your English.
Research on international students found that it appeared harder to improve in the productive language skills (Speaking and Writing) than in the receptive skills (Listening and Reading). The study found that the least average improvement was in Writing*.
Ask yourself the following questions:
If you answered "No" to any of the questions above, learn more about how to prepare here.
IELTS is a test of English language proficiency, so you need to work on all skill areas to maintain and improve your English. If it is a long time since you last sat the test, your language skills may not necessarily have improved, even if you have been living in an English-speaking country. Prepare thoroughly, and consider taking an IELTS preparation course as a refresher.
* "Investigating IELTS exit score gains in higher education", Kieran O’Loughlin and Sophie Arkoudis, The University of Melbourne, IELTS: Volume 10: Research Reports 2009