I really like to integrate reading skills into writing skills. After all, what you read, no matter what, so long as it is written by someone whose English is better than yours, is a good example of writing. It will not pay off if you just enjoy reading it. There should be quite a few principles by which it is written. We should apply them to our writing.
TOEFL is a test that measures our ability to do all the above. If you look at the writing scoring guide, all the criteria, including very basic ones like spelling errors, apply to reading. “Spelling? What does that have to do with reading?” If you have a question like this, I can tell you that I have seen countless numbers of test-takers who misunderstood the passage because they confused two different words like “nothing” and “noting”.
When you are reading, therefore, you are practicing writing, and vice versa. Efficient learners study both at the same time.