Edited to add: I Guess I didn't really address the point specifically about not studying and struggling with the tests. That was me the entirety of my education, from the first grades I can remember all the way through my 8.5 years of college with 2 degrees. I just didn't care, especially when the homework itself wasn't graded. I'm not sure how to help on that point specifically, other than to say that you're not alone, and I made it with similar issues.

It's really difficult to stay motivated for as long as we're in education. Do you know where your current standing is specifically in those two courses? Could you go to those two professors and voice what you're facing and see if there's any recommendations they can provide you?

It's ok to fail. We don't want that to be our normal state but it's ok. It's ok to be tired and struggling with motivation. A big part of learning is learning how to adapt to new situations and not just learning a particular topic. College is about both and then some.

What year are you in? Some of those early courses are meant to get you to the next step, and some (it's been a while for me, maybe it isn't this way anymore) seemed like they were intentionally designed to get people to quit. Weed out courses, so to say.

One of those weed out courses I went through was a huge attendance first level physics course that it seemed like nobody was doing well. About 1/4 dropped it over time to avoid the failing grade.

In the end, the professor did a flat full 2 grade "curve" for everyone that stuck it out. I don't think his intent was to teach, I think it was to break those who would be willing to drop. I don't like the concept of those courses, and I don't even know if they exist anymore, but that's also something to consider if the ones you're failing in have that kind of feeling to them.

Keep trying, you're not a failure just because you've failed at something, and sometimes this is part of life. You've got this.