I've audited and taken notes for about 7 courses so far, 3 physics and 4 math off of ocw. I consider myself a pretty intelligent guy and I normally do well when it comes to solving problems but some of the ones given in there just crush me at times. I'm trying to complete a problem set a day, but very often I'll have to completely leave a problem for a few days before coming back to it and finishing it off. Is this normal due to the fact that we're studying by ourselves?

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