What should I do if I am failing a level maths

Hello I need help, so I started year 12 this September and I chose 4 subjects which include A level maths, physics, 3D design and 1 BTEC subject which is engineering. I have been struggling with my subjects especially A level maths, I have had two baseline tests and ended up with U's on both exams. Other than that my physics grades are fine as I am working at a B same with 3D design and I'm doing decent for engineering as well. Only issue is that I have been threatened to be kicked off A level maths due to my poor grades, I want to pursue a career in aeronautical engineering and if I have to drop maths I won't be able to get into the course I want. I have also been given the choice to drop one of my other subjects that don't include maths, if I were to pick one subject to drop id say 3D design but the issue is I'm not sure if some universities will accept me with 2 a levels and 1 BTEC without doing a foundation year. Please help I am not sure what to do as I don't want to do a foundation year.