The syllabus of UPSC is so extensive that it covers the concepts of every other exam. If you take a closer look at the syllabus of state-level Civil Services exams and UPSC CSE, you’ll notice how everything is more or less the same. The only significant difference is that the PCS exams focus more on the topics related to a particular state. For example, the questions in the exam for Punjab Public Civil Sevices will feature more questions based on the history, geography, politics, economy, etc. of Punjab. So, you’ll have to give more attention to attain the knowledge of the state you want to apply for. But a look at the broader picture will give you an idea that preparation for UPSC CSE covers every aspect of these exams too.