The F-1 or J-1 visa stamp in your passport is permission to apply to enter the United States in that visa category. Canadian citizens are not required to have a visa stamp in the passport to enter the U.S.
The F-1 and J-1 category of visa will allow you to enroll in credit bearing classes at a Student and Exchange Visitor Program approved school in the U.S. Visitors who arrive to the U.S. under other visa classifications may not have approval to study. You can refer to this chart to view other classifications and the ability to study under those classifications
It is okay to remain in the U.S. after your F-1 or J-1 visa expires as long as your passport and I-20 or DS-2019 are valid, and you are a continuing full-time student. The visa expiration date is separate from your length of authorized stay in the U.S.
If your visa expires while you are in the U.S., the next time you travel internationally you must apply for a new F-1 or J-1 visa in order to return to the U.S. This is also true if your visa has a limited number of entries that have been used, or if you have changed your nonimmigrant status while in the U.S.
You cannot apply for an F-1 or J-1 visa inside the U.S. Visas can only be obtained outside of the U.S. at a U.S. Embassy or Consulate.
It is advisable to apply for the visa at a U.S. consulate in your home country, unless circumstances or travel plans make this impossible. It may be possible to apply for a visa at a U.S. consulate in a country other than your home country. This is called a “third country national (TCN)” application. Not all U.S. consulates accept TCN applications, and some allow TCN applications for limited situations; check with individual consulates, including those in Canada and Mexico, for TCN application policies.
It can be risky to apply in a country other than your home country. For instance, if you apply for a new visa in Canada and encounter delays, you must remain in Canada for the length of the processing. You will not be able to reenter the U.S. until the new visa is approved.
U.S. consulates require in-person interviews for most visa applicants. You are encouraged to schedule the visa interview appointment as early as possible. Students applying for initial-entry F-1 and F-2 visas may be issued the visas up to 120 days before the academic program start date as noted on the I-20. J-1 and J-2 exchange visitors may be issued visas at any time before the beginning of their programs.
The U.S. Department of Homeland Security maintains an excellent website on the visa application process, and you should study it carefully. You can also find information about how long it will take to get your visa. Visa processing delays may occur for a variety of reasons, with enhanced security reviews based on your field of study, country of origin, and likelihood of returning home after completion of studies. You must have your visa stamp in your passport prior to travel to the U.S.
TIES TO YOUR HOME COUNTRY
Under U.S. law, all applicants for nonimmigrant visas, such as student visas, are viewed as intending immigrants until they can convince the consular officer that they are not. You must therefore be able to show that you have reasons for returning to your home country that are stronger than those for remaining in the United States. "Ties" to your home country are the things that bind you to your home town, homeland, or current place of residence: job, family, financial prospects that you own or will inherit, investments, etc. If you are a prospective undergraduate, the interviewing officer may ask about your specific intentions or promise of future employment, family or other relationships, educational objectives, grades, long-range plans and career prospects in your home country. Each person's situation is different, of course, and there is no magic explanation or single document, certificate, or letter which can guarantee visa issuance. If you have applied for the U.S. Green Card Lottery, you may be asked if you are intending to immigrate. A simple answer would be that you applied for the lottery since it was available but not with a specific intent to immigrate. If you overstayed your authorized stay in the U.S. previously, be prepared to explain what happened clearly and concisely, with documentation if available.
ENGLISH
Anticipate that the interview will be conducted in English and not in your native language. One suggestion is to practice English conversation with a native speaker before the interview, but do not prepare speeches! If you are coming to the United States solely to study intensive English, be prepared to explain how English will be useful for you in your home country.
SPEAK FOR YOURSELF
Do not bring parents or family members with you to the interview. The consular officer wants to interview you, not your family. A negative impression is created if you are not prepared to speak on your own behalf. If you are a minor applying for a high school program and need your parents there in case there are questions, for example about funding, they should wait in the waiting room.
KNOW THE PROGRAM AND HOW IT FITS YOUR CAREER PLANS
If you are not able to articulate the reasons you will study in a particular program in the United States, you may not succeed in convincing the consular officer that you are indeed planning to study, rather than to immigrate. You should also be able to explain how studying in the U.S. relates to your future professional career when you return home.
BE BRIEF
Because of the volume of applications received, all consular officers are under considerable time pressure to conduct a quick and efficient interview. They must make a decision, for the most part, on the impressions they form during the first minute of the interview. Consequently, what you say first and the initial impression you create are critical to your success. Keep your answers to the officer's questions short and to the point.
ADDITIONAL DOCUMENTATION
It should be immediately clear to the consular officer what written documents you are presenting and what they signify. Lengthy written explanations cannot be quickly read or evaluated. Remember that you will only have 2-3 minutes of interview time.
NOT ALL COUNTRIES ARE EQUAL
Applicants from countries suffering economic problems or from countries where many students have remained in the U.S. as immigrants will have more difficulty getting visas. Statistically, applicants from those countries are more likely to be intending immigrants. They are also more likely to be asked about job opportunities at home after their study in the U.S.
EMPLOYMENT
Your main purpose in coming to the United States should be to study, not for the chance to work before or after graduation. While many students do work off-campus during their studies, such employment is incidental to their main purpose of completing their U.S. education. You must be able to clearly articulate your plan to return home at the end of your program. If your spouse is also applying for an accompanying F-2 visa, be aware that F-2 dependents cannot, under any circumstances, be employed in the U.S. If asked, be prepared to address what your spouse intends to do with his or her time while in the U.S. Volunteer work and attending school part-time are permitted activities.
DEPENDENTS REMAINING AT HOME
If your spouse and children are remaining behind in your country, be prepared to address how they will support themselves in your absence. This can be an especially tricky area if you are the primary source of income for your family. If the consular officer gains the impression that your family will need you to remit money from the United States in order to support themselves, your student visa application will almost certainly be denied. If your family does decide to join you at a later time, it is helpful to have them apply at the same post where you applied for your visa.
MAINTAIN A POSITIVE ATTITUDE
Do not engage the consular officer in an argument. If you are denied a student visa, ask the officer for a list of documents he or she would suggest you bring in order to overcome the refusal, and try to get the reason you were denied in writing.