125 beginner= 1st turn pit stop
On nearly every first turn in 125 c class or beginner, people follow each other way to closely or dont hit there brakes early enough. The best line, not always a holeshot but you always make it through, is lining up on one of the outside gates. Practice your starts at least 20 minutes a week, repetitious, but important. Now you want to stay 2 bike lengths outside to the pack, find the widest gap thru turn 1 and try to stay on the gas. Guaranteed, you will be at least 15/40 if your holeshot technique is decent.
Good luck!