Buyers from all over the world have bought these self-study books. Yes, from all over the world: The USA, the UK, France, Australia, New Zealand, Denmark, Japan, the Middle East, Africa, South East Asia. And they include self-study learners from all parts of India — from Kashmir to Kanyakumari.
And the self-study learners belong to all walks of life. There are self-study learners who are very highly educated and very highly placed — and there are those who are not so very highly educated or so very highly placed. There are self-study learners who are just 18 years old — and there are those who are as old as 80 years. But there’s one characteristic that’s common to them all: They’re people who do things that are important enough to need a high degree of fluency in English. The self-study learners from India include:

(1) Judicial Officers.
(2) Diplomats.
(3) IAS/IPS/IFS/IRS Officers.
(4) Other senior Central and State Civil Service Officers.
(5) Commissioned Officers. (6) Advocates, Doctors, Engineers.
(7) Scientists, Professors, Lecturers, Research scholars. (8) IT Professionals.
(9) Top executives in companies & banks.
(10) Businessmen, Accountants, Sales Personnel.
(11) Journalists.
(12) Candidates for the Civil Service examinations.
(13) Candidates for superior jobs.
(14) People seeking admission to MBA& MCA courses.
(15) TSE candidates. (16) People planning to go abroad.

And they even include District & Sessions Judges, Ambassadors, a High Commissioner, a Consul General, Commissioners of Income Tax, IGs of Police & Registration, General Managers & top executives of private & public undertakings (including multi-nationals)... a Test Cricketer... and legislators, including a Chief Minister.