I am a second year undergraduate and studying quantum mechanics from sakurai's 'Modern Quantum Mechanics'. Is it a good idea to solve problems from sakurai, which are mostly mathematical in nature? I need a textbook that has physically relevant problems, maybe going even into condensed matter, or field theory in its exercises. This would probably help me to appreciate and understand qm better. Sorry if this question is too localised but I just had to post it.
There is no one ideal textbook or source of problems of any particular type, and even if you did find one, if you are at all serious about earning a degree and having a career in physics or engineering, you'll be best off doing all the problems you can find in all the textbooks you can get your hands on.
Well, that might be absurd - there are too many books in the library written over the decades. But do keep at it, never resting just because you finished working some set of problems. Especially push yourself to do some problems that aren't the kind you prefer. Physics is not ever going to be easy.
Besides, no matter how applied / theoretical / mathematical a text is, they're all relevant to physics. Physics progresses only by the interplay of experiment, applied physics, theoretical physics, and abstract math.