Here are the steps for you to become financial manager :

STEP 1 : After your 10th std , do your 12th std in a stream like science and commerce . After your 12th std earn your Bachelor's degree in either management courses like bachelor's in management studies, bachelor's in commerce , bachelor's in accounting finance , bachelor's in business administration etc : Your field of study should be finance, accounting , business etc: 

You can even do engineering if you want to .

STEP 2 : After getting good marks in your 12th and bachelor's degree , prepare yourself for entrance exam for MBA ( MASTERS IN BUSINESS ADMINISTRATION ) . This is your first major step for becoming a financial manager . Give entrance exams like CAT , XAT ,MAT ,NMAT SNAP ,MHT CET. CAT entrance exam is common in all over india , other exams are  for private universities . 

STEP 3 : After you get good marks in your CAT entrance exam ,like really good , then apply for top MBA colleges in india like : IIM'S and get admission in MBA FINANCE and score good marks in it too. You can also join MASTERS IN MANGEMENT STUDIES IN FINANCE (MMS) , but MBA is preferable. 

STEP 4: After that join a company and gain some work experience . See financial managers are a top professionals in their field , so to be at the top your have to start from bottom.

STEP 5: Do some extra certification course like . CFC ( CORPORATE FINANCE CONSULTANT ) or CFA (CHARTERED FINANCIAL PLANNER ) or CERTIFIED FINANCIAL PLANNER or FINANCIAL MODELING CERTIFICATION or CERTIFIED CREDIT PROFESSIONAL (CPP ) etc : 

STEP 6 : Get your dream job as a financial manager .