I have a gap of 4/5 years as I did drop after 12th in which I passed out in 2018. Can I study abroad?

There is no such restriction considering gaps. Taking a break or gap year does not leave a bad impact on your profile or your application to study abroad. The only condition is that you have a proper explanation for your break or gap year. 

What I mean by a proper explanation here is that you need to prove you were not wasting your time as that can show you are not motivated and serious enough for your studies and your career. If you were involved in a club, participating in any extracurricular, learning something new etc than that gap year won’t be considered waste and will definitely not affect your profile in any manner. 

If you need any help with deciding what to include in your profile and how to justify your gap year, you can directly get in touch with Study Abroad Experts here. They will analyse your profile thoroughly and will suggest about the best things that can weigh over your gap year. 

Hope this helps!