If I could plan to do anything I wanted to, I'd like to go to Tibet and travel through as much as possible.
This was one of China's college entrance examination questions. The answer was 'could'. But the phrase 'If I could plan to...' sounds a bit odd to me ('plan' means 'want' here or 'make a plan'?). And need we use 'wanted' rather than 'want' in this sentence?
Could I ask native speakers to help me please? Thank you in advance.
It is expressing a wish to do something is it was to be possible to do. It is a normal usage.
On the other hand, this is not good usage: and travel through as much as possible in the context. It would be more usual to say "and travel through as much of it as possible".