I've been lifting for the past 2 months with a 5X5 program. I just tested my lifts and ended up with 120 kg Squat, 70 kg bench press and 140 kg deadlift at a bodyweight of 60 kg. I'm 15 by the way. Is it possible for me following a program where i add 5 kg to my 5RM in the squat and bench, and 10 kg in the deadlift every four weeks? That means a good 30-40 kg increase in my lifts. Is this possible?