I think Btec is like an a-level but is more practical based. I know for sure that at my school IT a-level is coursework based(similar to GCSE), but a BTec is basically how the network and internet works etc. (cicso or something like that).
...I guess you might have put it down as a Btec instead of an a-level, or your school simply does btec. Not much of help, I know.. Sorry!