As a young adult of 25 years old, how often should I be going for health checkups/screenings? What kind of checkups/screenings should I do and how much would they cost?

Once every 2-3 years should be sufficient, unless you find something wrong with your body (touch wood) then it would be good to check whenever it's necessary. Try to do a full body check (including blood and urine tests).

General guidelines for health screening in my company:

35 years old and below, once every 2 years

Above 35 years old, once every year

It is recommended to do a check up at least once a year or once every two years. Just to have a piece of mind.

It is usually through such check up that we detect abnormalities in our body and we can always follow up on them immediately to save ourselves from potentially life threatening issues.

It is generally affordable to go to GP and polyclinic for such check up. Check with your personal insurance and company health benefits. Some do cover such medical check up costs.

I would recommend you to do a general checkup every year for a piece of mind. It should be pretty affordable from $50 to $100 bucks at GPS and Polyclinics.