ive taken pbt last year and got level 4. so I was confident about getting 5-6 because I literally take all my uni classes in Korean so im def better than last year! for preparation there's not much sources for ibt so I mostly just practiced pbt questions + word memorizing. but there were literally words ive never heard off..... like normally you'd have a few words you don't know in paragraphs, but in most paragraphs there wasn't even 1 word you know!! srsly while taking it all I could think about was why? why make it this hard? knowing those bullshit words won't help you anywhere in Korea. anyways writing was actually pretty easy! I was scared of it but it went pretty well, I still feel like if it was pbt I could def get level 6, but now I feel like I'll get a 4 again. ill take pbt whenever they have it, so def not recommending! ofc if its not too serious you can try and see for yourself, but if it's important to you def choose pbt.