As explained before, the ideal time to attempt Task 1 is around 18 minutes. It is important to be able to scan important details quickly and start writing! The basic principle of writing the introduction for Task 1 is to paraphrase the given statement in the question.
Sample Introduction
The vertical bar graph depicts the reasons for studying based upon the age of students ranging from under 26 to over 49. The data has been calibrated in percentage.
Introduction Breakdown
The vertical bar Here I define the type of the graph.
graph Here I write the number of graphs. Since it's a single one, I write 'graph'
depicts I used a synonym for 'shows'; This is where paraphrase is used.
the reasons for studying based upon the age of students Highlighting what the graph is about
ranging from under 26 to over 49 Pick up the range from the x-axis
The data has been calibrated in percent This is a standard line; to be used as the last line for majority of the graphs.