It depends on your study habits. People not long out of uni, with paractical engineering training and experience or who need to study with their work can often study through the entire PPL course and pass the exams in a matter of days. But someone who may have left school ages ago, and have a noisy young family at home may only be able to study elsewhere.
People who have done TAFE or flying school theory courses rarely fare any better at the cyberexam than those who have self studied.
And last time I advised someone to sself-tudy their Trevor Thom books I was greeted by a blank stare, as they are now in exactly the same format but come under another name!