Introduction:
The IBPS Clerk exam is a highly competitive exam conducted by the Institute of Banking Personnel Selection (IBPS) to recruit candidates for the clerical cadre in various public sector banks in India. The syllabus for the exam consists of various topics related to English language, reasoning ability, numerical ability, general awareness, and computer knowledge.

Importance of covering all topics:
It is highly recommended to cover all the topics mentioned in the syllabus for the IBPS Clerk exam. Here's why:

1. Comprehensive preparation: By covering all the topics, you ensure that you have a comprehensive understanding of all the subjects. This helps in improving your overall knowledge and enhances your chances of scoring well in the exam.

2. Balanced approach: The IBPS Clerk exam is designed to test your proficiency in different subjects. Skipping certain topics may create imbalances in your preparation, leading to weaker areas which can be detrimental to your overall performance.

3. Eliminating surprises: The exam pattern and question types may vary from year to year. By covering all the topics, you reduce the chances of being caught off guard by unexpected questions or topics that you have skipped.

Identifying key topics:
While it is essential to cover all the topics, it is equally important to identify the key topics that carry more weightage or are frequently asked in the exam. This can help in prioritizing your preparation and allocating more time to these topics. Some key topics for each section include:

1. English language: Reading comprehension, grammar, vocabulary, and verbal ability.
2. Reasoning ability: Puzzles, seating arrangement, syllogism, coding-decoding, and blood relations.
3. Numerical ability: Number series, simplification, data interpretation, and arithmetic topics like profit and loss, time and work, etc.
4. General awareness: Current affairs, banking and financial awareness, and static general knowledge.
5. Computer knowledge: Basic computer concepts, internet, MS Office, and operating systems.

Conclusion:
In conclusion, it is necessary to cover all the topics mentioned in the syllabus of the IBPS Clerk exam. By doing so, you ensure comprehensive preparation, maintain a balanced approach, eliminate surprises, and increase your chances of success. Additionally, identifying key topics within each section can help in prioritizing your preparation and focusing on areas that are more likely to be asked in the exam.