Please help me with this Ielts task 1 essay

The bar chart compares and contrasts data on the changes in the number of students going to four different schools in seven years from 2001 to 2007.

First, throughout all seven years, Seven Oaks was always the school which had the highest number of students; while Page Hill had the least. In five years from 2001 to 2005, Didcot Secondary and Royal Latin held second and third place, relatively. This changed in 2006 and 2007, when the total students in Royal Latin were higher than Didcot Secondary for about 50 students.

Although remaining as the school that had the most number of students in a period of seven years, the number of school-goers in Seven Oaks was quite fluctuating. It slightly declined from 2001 to 2003 and then went up till it reached the peak of more than 900 students in 2006. While Didcot Secondary was the one who had been keeping it the most stable, for around 650 students.

In general, there were many changes in the total number of each school's students in each year.