Hello!
Marine Biology is a very upcoming field and so the number of jobs are increasing for it too! But marine biology does require a pasion for it, because the learning curve is so great. No course can guarantee you a job, only your effort and interest can. The minimum educational qualification for pursuing a Bachelor's degree in Marine Biology is +2 or an equivalent with a high percentage of marks in science subjects such as physics, chemistry and Biology. You need to appear in the entrance exam for getting admission to the course. 

Good luck!