different study techniques work for different people, so it's truly up to you to see which study techniques work, based off the grades you get.
It's important that you don't just memorise the textbook, because it's important you understand the topic you're trying to revise.
So in my opinion, no. Because you can memorise information, but this doesnt mean you may understand it fully, so you may not be able to apply it to different contexts.
Make sure you're understanding the diagrams, methods, keywords you want to memorise, and use active recall so you don't forget key info.