Question paper leakage

My younger sister, who recently completed her JSC examination, isn't interested in her studies anymore. She says, “What is the necessity of studying hard, when exam papers are leaked very often?” I was totally unable to motivate her to study.
Now my younger brother is appearing in the HSC exams. The question papers of the exams are already available everywhere. We live in Nilphamari, far away from Dhaka. But the question papers are available here before any public examination is due. Not only that, questions of public university admission tests, medical college admission tests and BCS exams are also being leaked frequently, which is really a big threat to our education system.
How can I blame my sister? Seeing all this, I myself have lost the motivation to study for BCS exams!
Md. Imamul Islam
Sher-e-Bangla Agricultural University
Dhaka