IT BTEC or ALEVEL computer science

Help I want to study software programming but I can’t study a levels maths because I did maths foundation in high school so I have to pick either a level computer science or level 3 extended IT BTEC and also what’s the best combination of subjects to study computer programming

I would pick A Level CS should you wish to do a degree. I would then either resit GCSE Maths and pick the higher paper with hopes of doing A Level Maths or do A Level Maths privately. Should the uni that you want to apply to require a higher grade at GCSE, you would still need to resit GCSE Maths.
The BTEC is OK if you want to get a job right after college, even though I would recommend the professional IT certificate for the specific role.
If you want to apply to uni with the BTEC, note that some unis might not accept BTECs. If they do, they tend to prefer a BTEC in IT.
The best combination for CS degrees would be in A Levels in Maths + CS (physics and FM are optional).

I would pick A Level CS should you wish to do a degree. I would then either resit GCSE Maths and pick the higher paper with hopes of doing A Level Maths or do A Level Maths privately. Should the uni that you want to apply to require a higher grade at GCSE, you would still need to resit GCSE Maths.
The BTEC is OK if you want to get a job right after college, even though I would recommend the professional IT certificate for the specific role.
If you want to apply to uni with the BTEC, note that some unis might not accept BTECs. If they do, they tend to prefer a BTEC in IT.
The best combination for CS degrees would be in A Levels in Maths + CS (physics and FM are optional).