I did Maths, Economics & Biology from that list.
Maths- HUGE step up from GCSE, only take it if you got at least an A an GCSE or you are completely willing to try your best. Effort must be put in at all times & if you're someone who either wings exams or does last minute revision this ones not for you (learn from my mistakes haha). If you have a maths A Level it will look good on CVs & your UCAS application, overall a really good subject to have but bloody hard work.
Economics- Slightly difficult but nothing majorly challenging, never did it at GCSE but either way I didn't find it to hard. Pretty interesting at times but very boring at others. Again another good A Level to have & if you put in some good effort you can achieve a good grade in this
Having some interest in economics or business would be helpful but not at all essential.
Biology- Again a huge step up from GSCE, people may label it the 'easy science' but at A Level stage they're all quite equal. Not as hard as maths & sometimes interesting but I think GCSE biology was extremely easy & I feel like thats why it seems like such a jump. Another good one to have on application forms (any core subject from GCSE or difficult sounding A Level looks impressive haha)
From the others I know people who take them so i'll tell you a little of what ive heard.
Accounting- If this is AAT, not too difficult or challenging but I'd imagine theres a lot to remember. Loads of exams have to be taken for this qualification though so if you aren't too happy with taking them I wouldnt recommend it (my friend once did a 5 hour exam :O i think, dont take my word for it though ha)
History- Seems quite difficult, a lot of dates & people & things to learn & remember & I would imagine an interest in History is essential or you'll be extremely bored haha.
Law- Quite a few people choose this at my college, its very popular. Seems relatively easy tbh. My friend failed miserably in Biology & Psychology yet managed to get a high C, just to give you an idea & he barely revised.
Business Studies- Again seems quite easy compared to other subjects but no a level is an easy option at the end of the day.
Just a piece of advice- Work hard throughout the year & start revising a couple of months before the exam (i know seems like a long time) & you'll get the grades you want & deserve- or treat them like GCSEs & waste two years.