Read the below; do the mental fatigue symptoms sound familiar?
http://www.manhattangmat.com/blog/index ... you-crazy/If so, then part of the remedy is spending less mental energy earlier in the test. When you decide to move forward with a crazy hard IR or quant problem, the decision you're making doesn't only affect the current section. It also affects all future sections, because you have a finite amount of mental energy.
So, first, all practice tests have to be under 100% official conditions, including essay, IR, length of breaks, etc.
Second, build your stamina while studying, too. Let's say that you're going to sit down for a 2-hour study session. In advance, figure out what you're going to do for the entire 2 hours. In fact, plan extra, just in case you finish early. Then GO for 1 hour without stopping. No checking email, no chatting with a friend, etc. Take a 10-15 minute break, then GO again for another hour, no stopping.
Then stop. Don't do the above for 4 hours straight. It's actually a lot more mentally fatiguing to study than to take a test. When studying, you're both recalling existing memories and trying to create new memories to use in future. When taking a test, you're only trying to recall existing memories.
So if you try to study for 4 hours straight, you'll be so mentally fatigued for the last couple of hours that you won't make very good memories... and your study time will be very inefficient.
Next, you may have been missing splits / patterns on SC because you may have been seeing some of the more convoluted types where the answer choices are changing a great deal. Use the below to help you study those types.
First, use this process to answer any SC question:
https://www.manhattangmat.com/blog/inde ... em-part-1/Second, here's how to tackle the harder ones:
http://www.manhattangmat.com/blog/index ... orrection/For CR - did you notice issues with inference questions in practice as well? If not, it might be the case that you just happened to see a couple of really hard ones in that category, so it makes sense that you struggled with them.
This article talks about CR in general and contains resources for the different question types, including inference:
https://www.manhattangmat.com/blog/inde ... reasoning/Now, back to the timing issue. If you lost only 1 minute, that's obviously not a major timing issue, but if it distracted you for the first 4-5 questions, then yeah, that could've caused a problem. For future, if you ever discover that you're 1-2 minutes behind at any point, that's really not a big deal. Just shrug it off and keep going. :)