A lot of the questions will be 100% the exact question word for word that you will get in an exam.
Some will be close copies, and others will just be awful.
A lot of people seem to be able to study using only the question bank and get around 75-80% on the exams. I'm not saying this is something you should do, but I think it is still possible, it certainly was 5 years ago.
The database used for the real exams is always being added to or amended, so a few new questions will appear from time to time, and this is where people come unstuck if they have only prepared using an existing database.
My only question would be why on earth have you started with the question bank before you've even signed up for the course? Is it still £50 for three months of access, therefore it will expire before you could be anywhere close to taking a real exam?