you said you have been boxing for 6 months, thats a good amount of time to get good or at least decent.
This was 3 days ago kid... You sparred twenty rounds already? You aint got to lie to kick it.... :good
i was taught to fully extend the jab and be use to missing and your elbow locking just incase you miss it in a fight you wont get hurt.
This is true, my former trainer at Wildcard always said make sure you turn the thumb down when you shoot the jab then rotate it back up as you bring your hand back. in other words wax on wax off, it also brings your shoulder up higher to protect you from getting countered on the chin.