In a large bowl, whip together the cream cheese, cool whip, and sugar until all ingredients are blended. Using small jars, glasses, or cups, place a layer of the cheesecake mixture in the jars. Top with a few berries and a bit of jam. (Make sure to thaw any frozen berries first) Repeat layers until the jar is full, serve immediately. You can also crush graham crackers and layer them in as well if desired.