How can i improve a score on Verbal Section??

While there is less content in the verbal section than in math (the only content is really grammar), you still need to practice extensively to learn the patterns and common question types in verbal, to develop your critical thinking skills to allow you to answer questions effectively and efficiently, and to improve on these questions.

Be sure whatever materials you are using provide clear step-by-step approaches to all question types, so that you know how to approach them, you have options, and you are never sitting there on test day staring at the screen. You should have an idea after some preparation, on how to approach assumption questions, versus strengthen/weaken questions, versus flaw questions, in critical reasoning for example. You'll start to see the same types of patterns show up again and again in your practice materials.

You should also READ as much as possible between now and test day, in English. The more you read, the more you improve your comprehension, your speed, and your grammar skills. GMAT materials are the first choice, but all reading in English will have some benefit.

Finally, be sure you are practicing sufficiently on the computer, as some people struggle more with verbal on a computer rather than in a book, and that you are timing yourself and building your time management skills.

Good luck!