The charts below
The diagram
In terms of synonyms, the writer chose the wrong word equivalent for the chart. A chart is not the same as a diagram. By definition the difference is:
Chart - a sheet exhibiting information in tabular form or a graphic representation, as by curves, of a dependent variable, as temperature, price, etc.; graph.
Diagram - a figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc.
Based on the difference in word meaning, the word equivalent chosen is incorrect and will cause definite LR score deductions as the writer shows that he is not capable of using a word within the correct meaning.
The summary overview cannot be scored highly due to the confusing information presentation. It neither coherent nor cohesive since it is combining several seperate idea sentences into one run-on sentence. The result of which will cause a failing GRA score.
At this point the writer has already ensured that his essay will receive a failing score, regardless of the content of his reporting paragraphs.