I work out almost everyday cardio for at least 30 min 15 jogging 15 fast paced walking

and i do situps almost everyday

but i still can't manage to get rid of my stomach, which isnt thattttttt big but i want it to be flat by December

do you know any certain exercises to help me?

Stomach fat is often related to water retention so lay off the sodium and sugars, that may help. Try pilates or yoga to tighten and lengthen your abs by stretching.