Choosing A-levels

I am currently in year 11, and my options for sixth form have just come out. Skills is compulsory in sixth form and I really want to take Psychology, Sociology, and Criminology, which are all very heavy subjects and coursework based. Criminology is a level 3 certificate and is equivalent to an A-level, however it isn't an actual A-level and you need three A-levels to get into university so I would need another subject. I have been thinking about taking law in a close college after school from 4-6 after school Tuesday and Thursday, these subjects all go really well together but I am just worried that it would be too much.