The exercises listed in the worksheets help the student to develop the writing skills which he might require during his career throughout his life. There are various levels of worksheets which vary according to the grade of the student in which he is studying. A student with a higher grade is made to work with worksheets which have tougher exercises as compared to a student who is in a lower grade. Students in lower grades are usually made to do the basic level of worksheets while the students in higher grades are subjected to the advanced level of worksheets which make their writing skills even more polished.
You can find worksheets for a wide range of courses--almost any course you want to teach your children. These include spelling, writing, English, history, math, music, geography, and others. They‘re also available for nearly all grade levels. There are printable middle school, high school, elementary school, and even pre-school worksheets. There are other sources for worksheets also. You can find many public schools and private schools which will provide free worksheets for you if you buy textbooks from the school. Or you can usually find textbooks and workbooks at the public library, where you can also copy any worksheets that you want to use.