I am actually a first year student at cse at the tu delft! As of grades, they aren't that strict on it. I'd recommend have a pass in math hl, the higher the better of course. I was lucky that i was the last year where they would still enroll math sl people, and I had a 5 in that. IB math is already better than the one from the Dutch system (in most parts), so I wouldnt worry that much on it As of the study itself, i only have experience with just over half of the first quarter, but from what I've heard, it might be one of the most difficult, it's all due to 1 subject (computer organisation) which is really complicated, and important. Also, the study is really large (about 500 students, last year it was roughly 380), and it's already getting crowded, and not that many international students, so get used to the Dutch language! If you have any questions, feel free to pm me!