Dear candidate

No, you can't get admission abroad via JEE Mains, there are special entrance exams and processes for joining abroad and the first step you need to do is research about universities in abroad about the fee details, location about courses offered in there it would be better for you if you take SAT tests it kind of spot light your skills while admission and do research about what you require to join in universities abroad and most of the universities require you to write english proficiency language exams like TORFL or IELTS and for many of the universities you also needed to submit recommendation letters and essays and others and make a financial plan about paying the fee as you can take an educational loan and if you are reservation candidate government pays your fee party so, find the details about it and plan accordingly and now fill the college application form along with your personal essays and the Information needed and then submit it you generally get the application in the University websites or common websites and you need to get passport and visa permission to go abroad as different countries has different requirements.

All the best

Hope this Information is helpful