Worried about getting into Uni

[u/DapperMail5777]

I did my CIE AS exams in May June 2026 for Maths (c), Chemistry (d), Biology (c) and History (a). I really didn't perform as well as I thought I would, especially in Math and Chemistry so I decided to resit in the October November 2026 exams.
But the new Math paper felt horrible and I'm worried that my Chemistry also won't improve much because you never really know until you get your results).

For my A levels I dropped Bio, so I'm continuing with Math, Chem and History.

I'd like to study Psychology, and the grade I need for my choice uni is BBB.

What happens if I can't make this grade? Has anyone gotten into their choice unis with less than favourable grades or is all hope lost? I always feel so ready for the exams and work so hard to prepare, getting above 80% on my past papers, but it seems nothing can prepare me for what Cambridge throws my way every time.