I think it is probably good to start a collection of sentences can be versatile. Versatile sentences can be used in many ways. so, you wrote this:
I try to read more and more essays about IELTS topics, and I try to memorize some nice sentences and phrases to using in real test.
You can use that beautiful sentence for anything. For example, about friends:
I try to meet more and more people in order to have fun on the weekend, and I try to create nice experiences that we can share and remember.
Or about working:
I try to make more and more money in summertime of each year, and I try to do it while working fewer and fewer hours.
That is how you can CONSTRUCT great understanding even though you start with only one sentence.
Read Eckhart Tolle's
The Power of Now in your native language, and then read it in English. that is my most important advice! :)
Kevin, EssayForum.com