Can I switch universities after 1st year and transfer credits?

Yes, but it's likely you will lose some of those credits. Still, if you want to transfer, now is the time to do it. The longer you wait, the more credits won't transfer. Also, you must earn at least half of your credits from the university from which you get your degree, so transferring after two years guarantees you will have at least two years left as no university will transfer in more than 50% of the credits required for a degree.

Yes you can switch, but you'll have to ask the Uni you are going to whether they'll xfer the credits.

Possibly, yes. Depends on the course and the uni, and how well you did.

Yea