The 9th-grade textbook concludes the basic school course and focuses on complex syntax, punctuation, and preparation for the OGE (State Final Exam).
Are you focusing on a or preparing for the OGE exams ?
Русский язык (С. Г. Бархударов и др.)
Deep study of compound, complex, and mixed-type sentences.
The 2017 edition emphasizes "сжатое изложение"—a critical skill for the 9th-grade exams.
Don't just copy the answers. Read the explanations to understand the punctuation rules in complex sentences.