Hi!
I'll be honest, mental health support has not always been York's strong suit but there is currently a lot of funding being put into it so it will improve. This includes funding to Open Door and Nightline, both of which are run on campus. That being said, dyslexia support is great here- make sure you apply for a DSA through student finance and get a student support plan (SSP) through the uni which will include provisions such as extra time.
I was in tier 3 Vanbrugh in first year. It was my first choice but I also had medical reasons to need one of the rooms, I would say set it as high on your preference list as possible and then try and find a room swap if you don't get it? Accommodation selection definitely has an element of luck involved but this should help you put it in your favour.
Definitely find videos or resources on other college rooms to make your second choice! The uni website and Youtube are definitely good starts.
I wouldn't say York is druggie more than any other uni- if you don't involve yourself, you likely won't see much about it. If you surround yourself with the right people there won't be an issue!
Shuttles from East to West (the UB1 and UB2 are the free ones) run around every 10-15 minutes, though you can always walk or cycle if you would prefer.
Careers are really good- we have just switched over to Handshake to provide opportunities to students which is slowly gaining some really good employers!
There are also careers drop-ins available most mornings are more appointments are currently being made available for students to book. Definitely do some research beforehand in what kind of placement you may want to do and they should be able to help you
Hope this helps! Let me know if you have any more questions