It sounds like you're putting in a lot of effort with your GMAT FE preparation! For improving your reading comprehension, especially with challenging science passages, consider these tips:
1. Skim for Structure: Before diving deep, quickly skim the passage to understand its structure and main ideas. Look for topic sentences and key terms that can guide your understanding.
2. Active Reading Techniques: Try summarizing each paragraph in your own words as you read. This can help reinforce your understanding and keep you engaged.
3. Practice with Variety: Incorporate a mix of passage types in your practice to build familiarity. The more you expose yourself to different topics, the easier it will become to tackle them.
4. Time Management: Aim to spend about 1-2 minutes reading the passage and then allocate around 1-1.5 minutes per question. Adjust as needed based on the complexity of the passage.
5. Focus on Key Details: For hard questions, identify keywords in the question that relate back to the passage. This can help you locate relevant information more efficiently.
6. Stay Calm: If you find yourself blanking out, take a deep breath and refocus. Sometimes a brief pause can help clear your mind.
Keep practicing, and don't hesitate to revisit challenging passages to build your confidence. You've got this!