I'm going towards permanent residency and want to send my EOI soon. Therefore I need to get my university degrees approved.

I've read the manual here: https://www.immigration.govt.nz/opsmanual/31313.htm but not completely sure...
Is it correct that you always need a full IQA for the EOI? That would mean the Pre Assessment is actually just a waste of time and money (as was reading in this forum, too).

Also I have a Bachelor of Science and a Master of Science. Do I need to make the IQA process twice and paying $746 two times?
Actually if I just get my Master approved and maybe even at level 9 that would give me enough points, then my Bachelor degree would not be necessary to assess, correct?

Thank you very much in advance!