What you'll practice: pointers, memory allocation, strings, and function behavior. Difficulty: Easy to Expert. Questions count: 25 per level (100 total) in the main C quiz.
Most interview filters happen at this level. Recruiters check whether you understand how memory behaves, not just syntax.
Double free, use-after-free, reading uninitialized memory, wrong format specifiers, and misuse of arrays vs pointers are frequent rejection points.
Attempt timed sets, note every mistake category, and focus on explanation reading. That converts random guessing into stable problem-solving skill.