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You will need to obtain a four-year undergraduate degree from an accredited institution. Technically, your degree can be in any subject, but a degree in Catholic Philosophy is preferable. Your grades upon graduation do not need to be top-of-the-class, but you should be an average or above average student. You need to take a two-year Pre-Theology Program consisting of 30 credit hours of philosophy courses and 12 credit hours of theology courses. Note that you might be able to satisfy the requirements in part or in full during your undergraduate education if you take courses from a Catholic university that match the courses required in a Pre-Theology Program. Attend a Catholic Seminary and obtain a four-year graduate-level degree.  In order to get into a seminary school, you might need letters of recommendation from current leaders within the church. Academically, a seminary will prepare you by offering courses in Biblical studies, Catholic philosophy and theology, liturgy, pastoral studies, church history, and preaching. Additionally, a seminary should help you discern once and for all if you are called to a religious vocation. This means preparing you academically as well as spiritually. Entering into seminary is not a permanent decision. You are not committed to the life and work of a priest until you take your final vows. Usually, you will need to spend six months as a deacon before you can be ordained a priest. As a deacon, you will be expected to actively take part in the running of a parish to which you will be assigned.  In essence, the time you spend as a deacon is like a trial period for priesthood. You will be assigned many duties by the priest of your assigned parish, and these duties often include many that you will have to take care of as a priest when the time comes. The priest of your assigned parish can voice his opinion on whether or not he believes you to be fit for the priesthood. With all of your educational requirements completed, the final stage in the path to priesthood is gaining the bishop's approval. If the bishop of your diocese determines that you have what it takes to be a good priest, you will be ordained.  Once the bishop of your diocese approves you, there will be an official Ordination Ceremony during which you will take your vows and officially become a priest. After taking Holy Orders, the bishop of your diocese will assign you a position. Usually, you will be appointed as a priest or assistant priest to a parish within the diocese, but sometimes, you might be appointed as a chaplain to a Catholic hospital or another similar post. You might be able to make requests, but your requests may or may not influence your final position.

Summary:
Earn a Bachelor's Degree. Enroll in a pre-theology program. Get a Master of Divinity degree at seminary. Spend time as a deacon. Become ordained.