Operating System is a easy part to prepare. Most part of OS you need is to “memorize” the algorithm, policy or the rule.
In Operating System, students just need to memorize the following parts
1. Disk Access Algorithm
2. Page(Paging) Algorithm
3. Banker’s Algorithm
5. File System – Windows(FAT) and Unix(i-node)
6. Concurrency, Semaphore and Monitor.
7. Virtual Memory
In NYU, Operating System has one great power point file, written by Allan Gottlieb.
The coming semester web page has the new version.
Once you have complete understanding of those knowledge, Core Exam OS part will no longer be a problem.