you cannot, as your rank is already decided once you are born.
You don't.
In India, it is nearly impossible to move up in the strict caste system.
In a class, you can depending how well you do, improve from one class to another class. In the caste system, one is born in a caste, and cannot move to another caste, except by reincarnation
No. Hindus cannot move up or down on the caste system.
It allowed people to move between castes
Yes you can, I'm pretty sure moving anywhere counts as a move up from the Indian caste system, you could move to being a Jew in Nazi Germany and it would still be better than being part of the Indian caste system.
it affected the caste system by bringing new content to the caste system.
Buddhism has no belief in caste system. It frankly rejected the caste system.
The Caste System
It is the religion of Hinduism that uses the caste system
The group outside the caste system are the untouchables they are'nt considered part of the caste system
certainly Buddhism was opposed to caste system. Hinduism invented caste system.