What aspects of English grammar do you want to improve? Spoken, written or working on grammar problems correctly?

Recently, I\\\`m using a grammar book called Contemporary English Grammar and Rhetoric 當代英文文法與修辭 (上). It was published by Crane文鶴. It is a book for practicing grammar problems. The sentences in the book are longer and more complex. It`s good for advanced students. You may go search for it!