I am looking at their entry requirements for the college:
https://www.cadcol.ac.uk/index.php/entry-requirements"At least 2 grade 6s at GCSE. At least a further grade 5s at GCSE. At least a grade 4 in GCSE English Language and Mathematics. If you do not have a grade 4 in one of these key subjects, you will be required to re-take this GCSE in addition to your A level studies."
They specify that you can take a GCSE in addition to your A Level studies, but you would need to confirm with the college whether they would be willing to let someone who hasn't taken GCSEs before to do it alongside the A Levels.
https://www.cadcol.ac.uk/courses/a-level/mathematics"A minimum of five GCSEs at grade 4 and above, including English, with at least two at grade 6. You should have Maths at grade 7."
https://www.cadcol.ac.uk/courses/alevel/business-studies"A minimum of five GCSEs at grade 4 and above, including Maths and English at grade 5, with at least two at grade 6."
So according to the specific A Levels, you would be looking at least 5 GCSEs, where your GSCE Maths is at least a grade 7, English grade 5, and the other GCSEs at at least grades 4.
can I study gcse at home or attend a secondary school at year 11 then get into A levels? You can study GCSEs at home, but it's likely to be expensive. Doing it at a secondary school or an adult college would be cheaper and quicker.
i was planning to go to cadbury college which can be attended if you are below 18 yrs old, so can i now study gcse for a year then attend a 2 year course of a levels? or i can do 1 year?
Strictly speaking, you would only need 5 GCSEs (Maths, English Language, 3 others). You can easily do these in a year if you want, but it might require quite a bit of hard work. If you intend to do GCSEs privately, try to pick the subjects where they can be done with 100% exams, because coursework invigilation for private candidates can be extremely expensive.
Whether the college would accept you after doing 2 years at GCSEs and then applying for your A Levels due to your circumstances would strictly depend on the admissions team/director of the college. I recommend you contact them to confirm:
https://www.cadcol.ac.uk/index.php/contact-us