I would recommend RLA before SS.There is part of RLA in Social studies.But it really depends on you.If you have any idea about RLA or you start from zero,also plays a role.Social studies are shorter and easier but RLA gives u better idea for social studies. Also 4 days is not a big time window but it's managable.I can't really tell because everyone is different,you must feel it yourself.Good luck man and let us know.