Everyone feels like they don't have control of the bike when they first start riding, I definitely didn't, it just takes practice mate, I'm currently riding a 125 and passed my CBT back in April, no bike drops for me during the test though I have laid the bike down once and had it fall over once (Never whilst riding though) - Don't be afraid to tell your instructor that you don't understand or want to go a bit slower than others, some people need more help some people need less, I needed a bit extra and my instructor was more than happy to accomodate. The weather is admittedly a bit shit to be doing a CBT in, specially with icy roads. Don't feel uncomfortable with your ability to ride, slow control on a bike is the hardest part to master, and that's why they teach you it first, riding like normal is a breeze compared to slow control. You more than likely can ride fine but just struggle on the slow control parts. Clear your head and get back to it, don't let a mistake get you down! Edit: Here's some advice that my instructor gave to me, look where you want to go. If you look where you want to go the bike will turn naturally towards that, same as if you shift the way your body is on the bike, if you have your body slightly to the left of the bike, the bike will naturally start going left, as the weight is shifting. Another recommendation I have is to watch "A twist of the wrist" it's a little cringey because it's old and has some poorly acted moments in it, but these are called the bikers bible with good reason, it's full of incredibly useful information and I have watched them, highly recommend watching both of them. They're a bit annoying to find though is the only bad bit.