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Please be informed that a Convent is the place where Catholic nuns stay in a group. All convents may not necessarily run schools ; Mother Teresa's Convents or the Convents of Missionaries of Charity rarely run schools. Convent schools generally follow the principle of inclusive growth in that they do not differentiate students on the basis of religion,culture, caste, economic status or other considerations. Of course, the fee-structure in Convent schools may be on the higher side compared with that in Government-run schools. But they also give special considerations for the underprivileged children.
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I did my schooling until high school in a convent school.
Answers:
1) No, I'm not a orphen. This may have cleared you first question but still for your information, convent schools are open for any students whose parents or organisation can effort tuition fees little more than other school under government (and in return improved facilities and guidance).
2) I'm a Christian but we had lot more non-Christian students than Christian student in our school regardlessly orphen or not.
3) Sure, students are selected to the school based on they abilities and talents but not caste or religion.