These are useful tips:
It can be a daunting experience when you first look at an IELTS Reading
Paper; there is so much text to read and the (at times) very technical
vocabulary and jargon that can be involved could cause a panic attack.
It might seem to be a mountain to climb to study and retain the amount
of vocabulary you need for such an extensive range of topics. It might
seem like reading an entire library but just take a look at these tried
and tested methods and you should sleep a lot easier.
I also came across with this article: https://rliberni.wordpress.com/2010/01/18/10-top-tips-for-improving-ielts-scores/