I was getting D's in 1/2 chem and stayed for 3/4. I'm sitting at B's now! Its much easier in year twelve even if you feel like you weren't able to get a good basis for chemistry in year 11. For some peace, I had no idea how intermolecular bonding worked until this year so anything is possible. Its also super helpful to find a great tutor that will be able to support your needs !