With the Technician license under your belt, pass another 26 of 35 questions from the General license question pool, pass the 5 wpm morse code test and you have a General license.
Pass the Amateur Extra written exam (38 of the 50 questions) with the General license in your possesion and you now hold the top license for amateur radio.
ARRL Amateur Exam Question Pools
73 (that means: Best Regards)