How do you become a strong climber on a bicycle?

Ride hills, and sprint the last part.

Ride in the saddle in a low gear, do an hour of climbing like that at 100rpm plus.

Then go out of saddle for last 200m of climb, going up a gear or two. Sprint.

Do that twice a week, for 10 weeks. Ride hills, and sprint the last part.

Ride in the saddle in a low gear, do an hour of climbing like that at 100rpm plus.

Then go out of saddle for last 200m of climb, going up a gear or two. Sprint.

Do that twice a week, for 10 weeks.