Study for around 30 minutes in a block , then take 10 minutes on another activity. (Not more study) Walk the dog, do something physical related. This will stop you overloading and losing too much that you have previously studied. Think of it as mental digestion time
Maybe repeat what you've learned a few times, and then build on that and repeat that a little. Give yourself a chance to fully digest everything, while continuing to move forward and learning more, at a pace that works for you.