What is the total number of questions asked in CDS English paper?
What are the total marks for the CDS English section?
UPSC CDS English Preparation Tips
What book should I refer for English grammar preparation?
Wren & Martin
What are some of the important topics to prepare for CDS English grammar?
Tense, Noun, Pronoun, Prepositions, etc.
What kind of questions comes from the grammar section in the CDS English paper?
Spotting error / Fill in the blanks.
How should I prepare for passage comprehension of CDS English paper?
If your understanding of English language and vocabulary is strong then this part will be easier for you. You just need to extract the correct meaning of the entire paragraph.
What is the importance of good knowledge of vocabulary section and how can I improve it?
Having good command on English grammar and vocabulary will help you in scoring more in various important sections such as spotting errors, cloze test, fill in the blank, sentence arrangement, and word substitution. For improving your English grammar skill and vocabulary you can study this book - "Word Power Made Easy" by Norman Lewis. It will help you in building your English vocabulary. Also, read English newspapers and note the meaning of unknown words.