My essay

The line graph gives information about the percentage of economic growth through the five-year intervals ending in 2010. Besides, the four pie charts also show the breakdown of household expenditure in the same pattern for a range of categories.
At first glance, the economic growth started at one percent, since after it remained steady up and down until about 2003 and then peaked at the highest point (roughly 4%) in 2005. After that, it was followed by a sharp fall and reached the lowest point in 2008.
The rate of economic growth was also proportional to the household expenditure, which is particularly true. In the half-decade. from 1995 to 2000, the two pie charts show a similar pattern when the proportion of necessary things like food and housing accounted for more than 50%. Additionally, the inessential items like clothes, entertainment, and travel, were up to a higher proportion when the economy developed well in 2005.
Viewed together, two types of the graph are indicated to have a strong bond, the more money people get, the more they spend, and vice versa.

I advise against using this practice test.

There are no units of measure on the Y-axis of the graph, and the pie charts have no indication of the actual spending values. There are no numbers (values) on the pie charts. Any correlation could easily be coincidence and misinterpreted as causation.

Throw this practice task in the trash bin.

Pick something else.

niceday04 line graph gives information about

That is vague and imprecise. "Give information about" is not grammatically incorrect, but it is not very good for a math/science essay where exactness, accuracy and precision is expected.

niceday04percentage of economic growth

There is no scale on the y-axis. You cannot just pick one unit of measure that you think about. See my previous post.

niceday04economic growth through the five-year intervals

I do not see that on this graph. It seems like continuous data is recorded, not 5-year averages. You did not give the starting point, either. The scale on the x-axis and frequency of printed values is unimportant. You can read values for every quarter!

niceday04At first glance,

This essay is intended for a university lecturer. Professors do not want you to glance at information, but study it carefully.

Do not use "glance" in such an essay.

niceday04The rate of economic growth was also proportional to the household expenditure, which is particularly true.

That makes no sense. Are you saying that if the economy grew 4%, people spent 4% more?

You have no numbers for the total expenditures, unless there is another table that you have not shown in the image.

niceday04Viewed together, two types of the graph (wrong expression.) are indicated to have a strong bond, the more money people get, the more they spend, and vice versa.

You have fallen into a trap. You have no information on how much people are spending. The pie charts only have percentages, not absolute values. You have committed the fallacy of confusing causation with correlation. One of the skills in critical thinking is to understand this fallacy and to be wary of falling into its trap.

Do not write conclusions in Task 1.

For instance, do the number of letters in a word in a spelling contest cause poisonous spiders to bite and kill people? The longer the word, the more deaths by spider bites there are.