It depends. If you do well in your GCSE's then you can do a level 3 BTEC which is equivalent to a levels, there's a one a level BTEC, a two a level BTEC and a 3 a level BTEC. If you get low grades in your GCSEs then you may have to start with a level 2 BTEC before doing the level 3 one. If you do the 1 or 2 a level BTEC then you may be able to do an a level or 2 beside it but I'm not sure if you can do more than one BTEC at the same time because they're all full time especially a level 3 BTEC there is no way you'd be able to fit another 1 in if you had to be in college 3-4 days a week