Don't drop out of school before you are done with your A-levels. Although GCSE's are accepted as an equivalent to Sudanese highschool diploma to gain entry to university. You will face alot of problems once youve graduated and start applying for jobs. Most graduate jobs and postgraduate degrees require UCAS points (calculated from your A-level results).

Although it's barely an issue at the moment it will effect you in the future if you decide to go back to the UK. It's just two years but it can open up alot of opportunity for you later on.

Source: Did my GCSE left school with no A levels studied University in Sudan now back in the UK and having to deal with all this mess!