the best method i have found was I GO, U GO METHOD it gives a complete burn in your arms.
Also another thing is when you perfomr i go u go method make sure you hand the weight to your lifting partner do not put the weight on the ground this destroy the training principles.
By the way i way 77 Kg and i can curl 55Kg for 10 reps on the cable curl. 40 kg for 20 reps on barbell curls all clean and my arms are 17 inches in size and thats mostly biceps.