I think only way is to write anonymous requests to NAB, telling them each and every detail since CCE 13 advertised.
Thkugh, it won't help in exam result. But a post result inquiry (if conducted) may help some desorious csndidates and kick out burglers from merit / successful candidate list. But even for that, chances are very slim (keeping in view the outcome of multiple inquiries, investigations, hue abd cry and verdicts, those who are favored still reaping rewards, got jobs, geting promotions, sccumulating wealth). No deseating and no punishment even 12 years passed and everything happend then is like open book even now.

so my advise, do something. Most appropriate plateform is NAB, but remain anonymous and be watchful of your backs.

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“Every saint has a past, and every sinner has a future.”
- Oscar Wilde