Just wanna let u guyz know either my diet planing is work out or nop?

My height : 178cm
Current weight : 80kg

I prefer my weight around 65kg-68kg...
This is wat i eat on weekdays:
Breakfast
- Sandwich tuna/egg
- 1 dutchlady strawberry milk

Lunch
- Chee Cheung fun
- Plain water

Tea time
- hotdog bun
- Plain water

Dinner
- Oat
- Milo

This is wat i eat on weekends:
Morning
- mostly din eat bcoz sleep until 12pm:P

Lunch
- mostly is fastfood (coz follow my fren eat)

Dinner
-Oat

i got join gym, work out time is tuesday, thursday and saturday/sunday..
sometime din go,bcoz need work overtime...
so any pro here , pls giv me some advise for diet