I would check and see if there is a formal dictionary on that specific topic. Then, Prepare and PhotoRead that dictionary once day for 4-5 days.
As you continue with the textbooks, as you come upon a term you are not familiar with, go look up the word and definition right away. Having PhotoRead that dictionary, you'll "burn in" a new connection between your visual conscious mind and the place in your non-conscious mind where you absorbed that pageful of text while flipping a page per second.
Adding each new word to a mindmap will help you commit the new word and definition to long-term memory.
