Donjuan,
Once you have cleared medical, you have to wait for SIA to call you up. It depends. Recruitment is a on a rolling process. It happens all year around even though SIA advertises once or twice a year in the papers. It depends on the intake. SIA will have to look at the number of successful applicants before they book anything with OBS, be it Singapore or Malaysia. As for the next intake, I am not that sure as I do know the past month's intake is quite huge. OBS normally lasts for 3 weeks. What to expect at OBS? I don't know what say about it, just that it's an opportunity to make friends and have fun. Well, I did have lots of fun at mine long time ago. Contracts are offered depending on the available slots. SIA has cargo and silkair too. It's just like NS posting. You never know as it's to the discretion of the company. So I can't tell you much here. It all ranges. When you have gotten through...there's nothing much surprising already.