Once again, I respectfully disagree with you.
Free materials, such as that "tip" you posted, are written in very poor English, and are difficult to understand even for native speakers.
As with anything in life, you get what you pay for. If you want free, you're going to get poorly written information of dubious quality, just like the hint above. If you want something well-written and well-researched, and you want to maximize your study time, then you have to pay a little bit of money.
I am involved in a company which produces such a product, and it costs less than 10% of what writing the IELTS usually costs. If I'm a student, I want the BEST study materials, and I want them composed by university-educated native English speakers.
Think of all the time wasted wading through endless amounts of borderline useless study material. How much of it is helpful? How much of it is detrimental? How much time are you wasting. Wouldn't you rather have a product that gives you exactly what you need? Isn't that worth 10% of the price of the test?
To me, it's a no-brainer. To our students, it's a no-brainer. To anybody that wants to succeed on the IELTS, save time, study less (but more productively), it is a no-brainer.
For anyone reading this, leave your email if you want to study less and score higher, and I'll get in touch. I can also offer a coupon code for anyone that responds in this thread.