nothing like anime music to study or work :D. in my case I have a couple of tastes depending on what I'm doing. if I'm studying or doing some work that involves concentrating a lot on texts or reading I prefer soft instrumental music with the case of ED Takt Op Destiny SYMPHONIA . an amazing melody.
when they are somewhat trivial activities that don't require a lot of concentration I prefer a little more animated songs to help me avoid exhaustion, a perfect one for this is the OP of Akebi-chan no Sailor-fuku, called Hajimari no Setsuna.