请教各位斑竹，看了OG和补充材料以及白勇的语法全解，还需要做大全吗？

It depends on your schedule and your target.  Though the items you had done nearly encompass the contents of 987, it's conducive to do them again in another format. Normally you'll obtain some new ideas  when you exercise the 2nd time.

A second time is a must!