Year 12s: what will be the first way you research your future options? >>

How hard is the new a level biology spec? (AQA)

I started year 12 and I chose biology as one of my a levels. I've heard stories from so many people of how hard biology at a level is and I'm so scared. I got a B at GCSE science so I highly doubt I will get A*/A at a level. My aim is a B at least. Has anyone does the new spec and did you find it hard and how were the exams? Also, does anyone have any tips on how to maintain a B throughout and get good grades. I'm super stressed and I can't stop thinking about biology a level everyday because I'm scared of failing.
Another thing is that everyone in my class are super clever at science and I'm the only dumb one so if I don't understand anything I'm scared to ask for help.