Introduction:
Solving previous year papers is an essential part of exam preparation, especially for UPSC exams. It helps candidates get an idea of the exam pattern, time management, and the types of questions asked. However, deciding whether to attempt all questions or prioritize certain sections for better accuracy depends on various factors.

Attempt all questions:
Attempting all questions can be beneficial for the following reasons:

1. Comprehensive coverage: By attempting all questions, candidates ensure that they cover all topics and sections of the exam. This approach helps in revising and reinforcing the concepts across the entire syllabus.

2. Familiarity with all question types: Solving all questions exposes candidates to various question types and formats. It helps in understanding the different ways a topic can be tested and prepares them for any surprises in the actual exam.

3. Time management: Solving the entire paper within the allotted time requires effective time management skills. By attempting all questions, candidates can practice managing their time efficiently, which is crucial during the exam.

4. Confidence boost: Successfully attempting all questions can boost candidates' confidence and provide a positive mindset during the exam. It eliminates the fear of leaving out any easy or scoring questions.

Priority-based approach:
Prioritizing certain sections for better accuracy can be advantageous for the following reasons:

1. Scoring sections: Some sections of the exam may have a higher weightage or contain questions that are relatively easier to answer. Prioritizing these sections can ensure that candidates score well in those areas, which can significantly impact their overall marks.

2. Weak areas: Every candidate has strengths and weaknesses in different subjects or topics. By prioritizing the sections where they are relatively stronger, candidates can maximize their accuracy and score more marks.

3. Time-saving strategy: If a candidate is running short on time during the exam, prioritizing certain sections can help them focus on answering questions they are more likely to know correctly. This approach minimizes the risk of spending excessive time on challenging questions with uncertain outcomes.

4. Smart guesswork: By focusing on sections of their choice, candidates can utilize their knowledge and make educated guesses to maximize their chances of getting correct answers. This can be particularly helpful when time is limited.

Conclusion:
In conclusion, the decision to solve previous year papers by attempting all questions or prioritizing certain sections for better accuracy depends on individual preferences, strengths, weaknesses, and time management skills. It is advisable for candidates to strike a balance between attempting all questions to ensure comprehensive coverage and prioritizing sections to maximize accuracy and score well. Regular practice, time management, and self-analysis of performance can help candidates fine-tune their approach and increase their chances of success in the UPSC exams.