Hi Suku93.
One thing you could do is each day read an article from one of the following publications.
• Smithsonian
• BBC History
• Life Magazine
• Economist
• The New York Times
• New Yorker
• Archaeology Magazine
• Science Magazine
• Scientific American
• Science Daily
• Astronomy Magazine
• American Scientist
• Atlantic Monthly
• Physics Today
• Wall Street Journal
• Harvard Business Review
Also, you can practice GMAT Reading Comprehension untimed and focus on fully understanding each passage and achieving high accuracy no matter how long it takes to do so. As you develop skill, you'll speed up naturally.