Standardized tests are hard. The English and Reading Comprehension section is especially challenging, because candidates have to combine their reading and analytical ability with a deep knowledge of English words, including very complex ones, and their usage in the right context. Verbal reasoning is never a cakewalk.
Until you go through this book.
It removes one main source of worry - that of acquiring and retaining a large English language vocabulary - from your preparation cycle. You will be able to focus on practice and getting better at delivering accuracy within a tight time limit.
Use it well!