Best way to do that is doing a short term course on Investment Banking. Depending on your location and means you should either find an institute in your local city or. pursue an online course preferably with proper mentorship to not only get a good idea of the course but also to be career ready on completion.

IIM Skills is one that comes to mind for it. Since an old friend of mine did his IB from there.  He had only good things to share for them. If  I am not mistaken they also have a demo class so won't harm you from checking  them out .

Hello,

Here are a few tips on how to become an investment banker, to engineer the next couple of years and your resume, to better your chances of breaking into Investment Banking. Start Working on Your Resume Early: Investment Banks like all rounders because an Investment Banker is not just a quant jock. He has to balance financial knowledge with analysis as well as client management skills. He has to have a background in working in a team. They like leaders. So make sure you are part of special projects in college and take part in significant team activities. It is also better to focus on excelling in one area, like case study competitions or football, rather than being a jack of all trades. Investment Banks want to SEE consistent academic performance as well as commitment to an outside activity as it shows them persistence and staying power. Look for an Internship: An internship is a great way to get a foot in the door even if it is for an extremely short time or the promise of hours of photocopying. It will give you that all-important insight into how a bank functions. Get Some Training in Investment Banking: Corporate Finance is hard and cracking an investment banking interview will be easier if you do a short training course in Investment Banking
Keep Abreast of Current Affairs: Investment Banking and Capital Markets is dynamic and require you to be on top of the news.

I hope this will help you.

All the best!!