Add punctuation: Students are generally college graduates and well educated in various topics but they all have one thing in common and that is to excel at trading
A: Students are generally college graduates, and well educated in various topics, but they all have one thing in common and that is to excel at trading.

Add punctuation: If no one claims the prize the jackpot will grow bigger every week
A: If no one claims the prize, the jackpot will grow bigger every week.

Add punctuation: Morning temperatures will be around 11 C During the day they will reach a maximum of 17 C Low temperatures at night will be around 9C We have brisk southwesterly wind During the night winds will shift to west and will be light
A:
Morning temperatures will be around 11 C. During the day they will reach a maximum of 17 C. Low temperatures at night will be around 9C. We have brisk southwesterly wind. During the night winds will shift to west and will be light.