For the end of year exams for music i gotta do a group and a solo performance should i do vocal or guitar? proberly have the same skill for both what should i do??
So you have to do vocal or guitar for both the solo and the group? Or you just have a choice in the solo?
Flip a coin. Several times. But do which one who think you will be better at or you will get higher marks or you will be least likely to stuff up. Or even the one you can practice for; because you can sing anywhere (almost) but you can't carry around a guitar everywhere.
Choose which ever will get you the best marks and you feel the most confident with. If singing will complement the others musical skills in the group, then do so... if guitar will, then do so. It's all about enjoyment and getting the marks.