Make sure that your passport’s expiration date is more than 6 months.
This is the reason why my friend and I did not proceed with our trip to Singapore, Thailand and Malaysia. The immigration did not allow her to leave the country. The airline staff explained to us that even if she allows her to leave, the country of destination will refuse her to enter and the staff member who allowed her to leave will pay a penalty. I figured, it’s not fun and safe to travel alone, so I decided that I will not proceed with the trip, too. We have forfeited all our bookings – airfare and hotel. I guess I’m not yet prepared to do an adventure alone. I need a company.