I'm guessing your AS results will tell you the answer.
keeping Spanish might get you further in the future?
had a talk from a woman in a lawfirm who said she spent her life looking for spanish/portugese speaking lawyers
food for thought?
I'd say Spanish, mainly due to "I may not remember the Spanish I have learnt this year and it seems like a waste of a subject", "Spanish speaking is fun and I'd love to do one of those courses where your 3rd year is abroad" and "Spanish will give me skills and make me more employable".
If you 'cba' learning vocab and don't particularly like it then it's pretty much a no brainer. Drop Spanish. No point in doing a subject you can't be bothered with. Terrible waste though really. It's much more valuable than RS.
I guess your AS results will probably help make you decide though.
Do you have to drop one -Im coping with four and General Studies. If your up for A's then Im sure you'd cope. This would enhance your chances of interview at Oxbridge. Do you start the syllabus directly after your As's ie June/July? Couldnt you try four and if it gets too much then drop one in Septmeber after your results.
Definitely Spanish, keeping it will not only give you an edge over other applicants to universities, but an edge over other applicants when applying for jobs. Employers love bi-lingual candidates as you never know when having someone that can speak the language may be useful.
To improve your chances for your future career as well as your university application; keep Spanish.
You said you don't like Spanish and you can't be bothered with it. Your A level result will most likely reflect this. It doesn't matter how valuable Spanish is, if you flunk it it's useless. Drop Spanish.