Hi AkB98,
You're ultimately asking Admissions questions, so you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/That all having been said, you're asking about a specific Program at a specific European School, so you might not find any Experts here who know the intimate details of that Program (and how best to apply to it). As such, you might consider reaching out to the School directly to ask your questions.
From your initial post, it sounds as though you're thinking about putting in a LOT of study time over a relatively short period of time. Going forward, you have to be careful about confusing "quantity" of study with "quality" of study. I've never asked anyone to study 30+ hours a week - and while it's great that you might have the available time to study that much, with that number of study hours, you would run the risk of 'burning out' before Test Day (and that is something that we want to avoid). If you are going to try to study that much, then I suggest that you take one hour "off" for every two hours of study. For example, you could study for 2 hours, then stop for an hour, then study for another 2 hours, then take an hour off, etc.
Statistically-speaking, raising a 450 to the point that you can consistently score 650+ will likely require that you commit to at least 3 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level. No one here knows you well enough to say for sure how quickly YOU might improve, but a 200-point increase in just 6 weeks might be too difficult of a goal to be considered realistic.
1) What was the source of your 1st practice CAT/mock?
2) What study materials do you currently have access to?
GMAT assassins aren't born, they're made,
Rich