What year is your Myvi made? Check this link: http://www.perodua.com.my/service-maintena...myvi-at-2014/60

Gear oil and transmission oil are the same thing don't you think?
Since you've changed your gear oil at 50k km, I would change the gear oil later at 90k km if I were you.

How old is your coolant? When did you last change it? If it's 2 or 3-years-old, then time to change it.

Summary: change engine oil, brake fluid, air filter and maybe coolant.
Don't expect to save money at the Service Centre, go to another workshop to save on costs.