Any advice from people who went through the hard-study time is appreciated. I started my dedicated study period this Monday and had significant decline today on both the quantity and quality of reviewing things. I'm not sure if it's due to mental or physical tiredness or both. I really need advice on how to adjust myself to an optimal condition. For example, when I can't focus on reading or doing questions, should I just go for a nap or go to the gym or drink another cup of coffee?