GRE Verbal Reasoning section would find your ability to analyse and draw conclusions, and how you understand and add value to data. you should also need to understand and summarise the structure of a text.
Apart from that Content information analysis and evaluation, Analysis of relationships between different parts of sentences, Distinguish between concepts and words and the relationships between them also matter a lot
Learn new words everyday for GRE. Also practice the usage of the words too. Know their sentence formations. Improve your vocabulary to a great extent as well. Look-out for new words in websites like OALD and Webster.
Practice as many reading comprehensions as possible just as you do in mathematics.
Check your Grammar on a regular basis. Follow the rules and improve their applications. Learn their basic usages and very importantly learn tenses.
The quantitative reasoning section will find out your basic mathematical skills. So try to practice standard mathematical concepts and their application in solving problems.
Make sure you practice concepts of elementary mathematics too. It includes Arithmetic, Algebra, Geometry and Data analysis.
Also solve as many sample papers as possible. For study material https://market.edugorilla.com/study-material/gre/
is a good option.