This is very common & easy for a person to get through the ISSB second time & there are many examples regarding this. Because a person going for ISSB second time knows all the procedures & have a clear idea.

Infact the procedure is simple as I have described above.

-Registration is done at PAF Information & Selection Centre.
-Intelligence Test is done first. This test is so simple and anyone can go through the test easily. Just you need to have a bit logical. Little practice can make you go through easily.
You are eligible for Academic test once you have cleared Intelligence Test. It is little difficult as English vocabulary must be there. Analytical ability needs to be practiced & Mathematics is also required. But it is also not very difficult.
-Initially Medical is done. Needs to be checked physically completely. Not very tough.
-Just a formality. Everyone clearing medical qualified for ISSB type detailed forms to be submitted in a day or two.
Please note there is no ISSB tests in PAF SPSSC.
-There are psychological tests exactly similar to CSS psychological tests. Nothing more than that. This includes sentence making (Urdu & English), Sentence Completion (Urdu & English), Complete Bio data forms, Story Writing (Urdu & English) etc.
-Once who qualified psychological tests & clears it, receives a call for an interview. Interview is done by special AHQ selection Board. This interview panel consists of subject specialist, Psychologist, Mathematician (Not necessarily) & chief of that board.
This interview is done in different ways, by pressurizing candidate, checking his analytical abilities, checking general knowledge & may be with small intelligence math questions etc. (TA/DA is paid to candidates)
-A person immediately after the interview comes to know about the status & one who clears receives a call letter to Combined Medical Board (CMB) Masroor Air Base Karachi. They assign you a date on which you have to report there. Complete Medical tests including X-Rays, ECG, Blood tests etc. & checking each & every part of body by specialists (dental surgeon, ENT specialist etc.). A detailed & very tough medical is done there in about 4-5 days. After complete medical examination, at the end of that CMB, candidates come to know about their medical result. Forms of clear, not-clear & referral are given to the candidates respectively.
(Residence is provided by them at CMB. TA/DA is paid to candidates).
Just remember that a candidate cleared from CMB is not confirmed for selection.
After this complete process of selection, complete results are sent to AHQ Peshawar where final selection is done & candidates selected are called.

Do ask me frankly if anything else you want to ask.

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Best Regards,,,