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Larger investment banks have established training programs for recent graduates that provide you with additional education as well as some hands-on experience working in the investment bank.  These programs are highly competitive, so don't get discouraged if you get rejected. Apply to as many as possible to increase your odds. Look at the characteristics of the last associate "class" to get a taste for what an investment bank is looking for in a new associate. The training programs for investment bankers are intense and grueling. Expect to work between 12 and 15 hours a day while you're in training, much of that time under stress. You'll typically need to pass exams to get a license to buy and sell stocks and other commodities for your clients as an investment banker. The training programs provide you with the information you need to pass these exams. Investment banking is still, by and large, a formal and traditional business. Wear a tailored business suit in a dark color, such as black or dark gray. Your appearance should be groomed and professional. Any accessories you wear should be understated. Avoid anything flashy or distracting. Depending on what you're doing as an investment banker and the laws of your country, you probably will need to get licenses or register with regulators before you can conduct certain activities as an investment banker, such as buying and selling stock for your clients.  If you were fortunate enough to get into a training program with a larger investment bank, they'll provide you the information and resources you need to pass licensing exams. Otherwise, you'll have to study for these exams on your own. You may be able to find study resources or even copies of old exams on the internet. Do a general internet search or look on the website of the department or agency administering the exam. Most licenses and certifications require you to complete a specific number of hours of continuing education courses each year if you want to maintain your license or certification in good standing.  Make sure your contact information with the department or agency that issued your license is up to date. They'll use it to send notices to you when your license is up for renewal. Try to spread your continuing education out over the whole year, rather than leaving it to the last minute. That way you can take classes that actually interest you and will benefit your clients.
Apply for training programs. Take an active part in your training. Dress the part. Get the appropriate licenses. Keep up with continuing education requirements.