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As you know, the original instruction already identified the image as a bar chart and yet, you failed to properly identify the type of image presented. This is a bar chart, not a general chart. A general chart does not contain a specific image identifier as required by the task scoring system. The image information summary is a run-on sentence. You need to split that up into at least 3 sentences to avoid GRA score deductions based on run-on sentence presentations. By the way, you forgot to indicate the gender basis for the measurements in the overview. That is important since there are several gender references now available to the public. Therefore, specific gender identification is necessary in the task 1 essay, wherever it is mentioned specifically.
Students are the measuring units.
Students are the measurement subjects. The measurement (measuring) units refers to percentage, ratio, numerical count (in the hundreds, thousands, millions, megawatts, etc.) There is no measurement unit refererrd to here so it is safe to assume that the students were measured in the thousands. However, were a measurement unit is not specified, it would be best if you do not mention any either.