These three grammar points have be causing me quite a headache in my reviews recently, even a question as easy as this I really forces me to rack my brain for the correct answer.
I feel as though the distinction between them isn’t strong enough. If anyone has a very smart way to tell them apart you will be my new best friend!! ∠( ﾟдﾟ)／
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ーいう only applies to nouns and usually starts a sentence. You see all the sentence with this/that/that over there/which kind have this in the beginning. If you know the very practical phrase どういう意味ですか, everything else falls into place for the KSAD forms
I think よう and みたい are more interchangeable than BP allows (I believe BP is still marking it wrong instead of asking for another meaning). Since they can be both adjective/adverbial and modify noun phrases, there is a of ton flexibility. My teacher allowed us to interchange these but agreed with with more casual tone for みたい that BP mentions. I find it more in conversational (and easier to say) while よう leans toward writing but I don’t think the rules are terribly strict for this one. Probably I forget when to add the の when speaking and I chicken out and go with the easier みたい 
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Oh my! thank you for the prompt reply! 
I have added these small distinctions to my notes, so I can look it over when I next get one wrong. Hopefully I can slowly learn the differences, oh and I do feel silly for asking but what is KSAD an abbreviation for?
Edit: Just realised KSAD = こ、そ、あ、ど, well now I really do feel silly >_<
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I’m struggling with these too. Every time I get a question that can fit that now I feel like I close my eyes and randomly point and one of them and hope I picked the correct one. (Although only みたい and よう, although I feel like there might be another one? Or it is just the different versions of みたい I suppose…)
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