The American comedian Henny Youngman had this joke:
The patient says, "Doctor, it hurts when I do this."
The doctor says, "Then don't do that!”
Unfortunately, some people have the incorrect idea that mathematics is about "solving problems", and lots of them, but it's not. The truth is that math since Euclid is about establishing and understanding basic relationships through carefully-defined concepts, theorems, and proofs.
The exercises are just a way to ascertain whether the student understands the principles instead of cheating their way through the material. If you emphasize a giant mass of exercises to the detriment of the concepts, then you've got the tail wagging the dog. Unfortunately, as societies try to present a facade that more of their citizens understand math, science, and engineering, this kabuki-theater becomes more prevalent, and the robotic (i.e., mechanically computable) exercise lists grow, absurdly, without bound.
Older textbooks from around a century ago had much shorter exercise lists, carefully curated, to highlight the essential discoveries in the presentations. Books now have longer exercise lists mostly to try throw chaff at cheaters, but it gives a bad impression about where the emphasis should be.
If you understand the essential concepts, then you don't need to do endless drill exercises. You will know what's at the heart of them all.
The OP already has their own answer, of course, writing:
One strategy that I adopted early on is going for a few questions
instead of a large number, this helped me develop my mathematics
abilities a lot
However, I suspect that they've been given a confusing message by their country's high-stakes and overly-intensive testing regime (again, a response to widespread cheating). Unfortunately there's nothing we as students or instructors can do to solve that. But we can share confidence that if we understand the essential principles, then any standardized-format problems will fall before us. The power of that kind of abstraction is, after all, the whole point of mathematics.