I feel you man. I'd suggest Elements of Programming Interviews in your preferred language. It does a really good job in my opinion of walking you through a lot of common tricks. I'm not really grinding through a lot of problems but doing a problem wrong, and then reading a well written explanation of the solution is a lot better for me in terms of learning. The study guide picks a good selection of problems for you to optimize for time. Some of the mathy/low level problems are bullshit that nobody would ever actually ask though. I felt like I got a good run through of some of the data structures that I just don't typically use in Java, and how they can be extremely useful in a coding interview.

LC problems are not always well written and a lot of times you just have to hope someone took the time to write out a good solution. A lot of times they just paste their code and expect you to get it.