honestly this is very frustrating. i get that getting the visa isnt a right, but these refusals are unfair. Genuine students are being rejected. I saw this guy got rejected with IELTS 7.5 CGPA 3+ and an overall very decent profile and another who had a scholarship ya phr funding from the professor im not sure. IRCC in all their stupid webinars, have been repeatedly saying AIP is basically an informal approval (unless medicals arent ok or other background checks) and you're good to start your studies online.
Also, what might be the proper way to start a complaint, to atleast look into the Abu Dhabi visa centre.