Data Sufficiency in WBCS Main 2014 Onwards

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Not seen in recent times in UPSC, but has been asked in pre-CSAT era, as part of age / sitting arrangement / blood relation type problems. Observe
(2006) P, Q, R, S and T live in a five storied building (ground+4), and each of them resides on a separate floor. Further,

T doesn’t reside on topmost floor
Q doesn’t reside on ground floor
S resides on one story above P, and one below R.
To know which person resides on ground floor, which of the above statements are sufficient?

only 1 and 3 sufficient
only 2 and 3 sufficient
1, 2 and 3 are sufficient
1, 2 and 3 are insufficient.
(2006) they gave four dice figures. and asked which of them are sufficient to find out the numbers opposite to each other.

Another Example:
Directions
This data sufficiency problem consists of a question and two statements, labeled (1) and (2), in which certain data are given. You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements, plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of the word counterclockwise), you must indicate whether:

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.
BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.
EACH statement ALONE is sufficient to answer the question asked.
Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.
Question
If a real estate agent received a commission of 6 percent of the selling price of a certain house, what was the selling price of the house?

(1) The selling price minus the real estate agent's commission was $84,600.
(2) The selling price was 250 percent of the original purchase price of $36,000.

(A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: (D)

How to prepare DATA SUFFICIENCY?

Prepare data sufficiency ONLY after learning all the theories in reasoning and mathematics- particularly age problems and number system.
MK Pandey Chapter 7, Page 203 onwards
(optional) RS Aggarwal’s chapter 17 on data sufficiency. Although that’ll be overkill, because MK Pandey’s chapter is far better and thorough than RS Aggarwal.

কিভাবে ডেটা সক্ষমতা প্রস্তুত করবে?
শুধুমাত্র যুক্তি সব তত্ত্ব শেখার পর ডেটা সক্ষমতা তৈরী এবং বিশেষ করে বয়স সমস্যা এবং সংখ্যা সিস্টেম mathematics-.
এম কে পান্ডে অধ্যায় 7, সামনের পাতা 203 তথ্য পর্যাপ্ততা উপর আরএস আগারওয়াল এর অধ্যায় 17 (ঐচ্ছিক). এম কে পান্ডে এর অধ্যায়ে আরএস আগারওয়াল তুলনায় অনেক ভালো এবং পুঙ্খানুপুঙ্খ , overkill হতে হবে যদিও।