1 RM

If I want to know my 1 RM by doing bench press, is that enough or should i also need to test each exercises that I’m going to do like dumbbell curl and after that concentration curl, in short all exercises should I need to test or just 1 bench press is enough to know my 1 rm for all exercises?

Do this plan. Its listed under the articles trianing section. http://www.workouttrainer.com/home/articles/get-the-most-out-of-your-reps