I want to go
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I take a cours in Cambodia study tour.
But this tour selected participant for examination.
So, I study English harder!
To go to Cambodia!
But this tour selected participant for examination.
So, I study English harder!
To go to Cambodia!

I want to go to Cambodia (go should used with objectiv, isn't it?)
I took a study tour in Cambodia.
But this tour selected his/the participant with an examination. (do you mean, that there is a exam for you all, before the beginning of this tour?)
So, I must study English harder!
To go to Cambodia! (think this would be better: in order to go to Cambodia!)