There is a gap of 3 years in my 10th and 12th so can I apply for a study visa?

Hey, yes mostly in all countries a certain period of gap period is acceptable however, it differs from country to country. Also, the study visa requirements differ as per the country you are applying to. 

You can go to CANADA, as mostly all the universities there allow a gap period of up to three years. 

You can apply for a Canada Study Visa if you fulfill the following criteria:

- You must qualify as a fully vaccinated traveler -AstraZeneca/COVISHIELD, Bharat Biotech Covaxin, etc. are some of the accepted vaccines.
- You have been accepted by a designated learning institute (DLI).
- You need to prove that you have adequate funds to pay for: your tuition fee, living expenses for yourself and family members who accompany you to Canada, and return transportation for yourself and any family members who accompany you to Canada
- You need to prove that you have a clean background and no criminal record. The aspirants need to produce a police verification certificate to prove this.
- You need to do a health checkup and produce a medical certificate that certifies that you are in good health.
- Also at the time of the visa interview, you need to convince the visa officer that you will leave Canada once you complete your studies.

Let me know if you have any other country in your mind, for further details!