A school text that includes space for you to write or do practice problems is a workbook. If you find your vocabulary workbook dull and tedious, ask your teacher if you can use Vocabulary.com instead!
Simply put, a workbook is a book that you can do work in. Usually, workbooks are paperbacks filled with problems or exercises that you're meant to do right in the workbook, rather than on a separate sheet of paper. Elementary school students might have workbooks for practicing printing letters or doing simple math, while high school students may use a workbook to prepare for taking a test like the SAT.