OC's test was designed to cook aspiring solicitors full of energy and dreams.Other firms with Watson Glaser/Critical Thinking Test (Apps still open):
Milbank
Cooley
Cleary Gottlieb
Addleshaw Goddard
I've made a list for Amberjack before on this thread, worth check it out.
Other firms use Cappfin and SHL (Ashurst, Osborne Clarke, etc). The rest are quite direct either with written exercise or interview.