@AD1516 Hi! From my experience puro sa email ang correspondence namin. If you will notice, parati sila may schedule. I would say hindi talaga warm ang approach nila. Very straight to the point sila. They'll tell you what you need to provide then they'll assist you getting in touch with the right institutions. Try emailing them frequently, dun ko mas madalas nakukuha yung answers sa mga questions ko sa kanila.
If you won't have any issue sa support, soon as makuha mo na ang CoE mo sa school it will be very fast to get your visa. I suggest submit what you have now basing on the list you got from IDP. They will tell you naman if you have any documents you still need to submit. In total I just went to the IDP office thrice. First for my consultation, second submission of requirements sa school, third is submission for the visa. Everything thru email.