O Levels.
GCSE or A levels
To get into most universities, GCSE's don't matter as much as A levels do. However, if they get a high percentage of people with good A levels, they will look at your GCSE levels. You usually need 3 A-levels to get into university.
O levels
you don't need any specific gcse's or a-levels but a degree in something will help to get a higher rank.
yes becasue with out good gcse u wont be able to do ur a levels
No, college is Gcse's university is A levels.
No you have to do English at GCSE level as it is a core subject along with Maths and Science. You get 2 GCSE's for English, 1 for language and 1 for literature. But you don't have to do English for your A-Levels after your GCSE's.
GCSE's can be a path way to doing a-levels, apprenticeship or a diploma, also many jobs will ask for at least 5 a-c gcse's as will colleges and university.
sciences and maths
No, but easier than A levels and university courses.
12 O-levels at grade A* or above 5 A-levels with minimum A*A*A*AA