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You have got 49% in class 12th.
Yes, you can easily get into a private engineering college or other stream colleges by either clearing a particular state exams where class 12th percentage criteria is 40% or 50%, or simply by management quota if you have money. Extra information to keep in mind before joining:
The next three years after joining a particular engineering college or commerce college tenure, you might forget your class 12th performance and move on to give your best shots in your semesters scoring 8 pointer and above (which is a great thing), but the moment you step into your fourth year, your 50% marks will come back in your academic life, as you are the biggest and probably the only hurdle in between you and your dream company job. Many a times your CV won't be even shortlisted (mainly the MNCs). So, you need to be prepared for this. But don't worry, If working in a big MNC is your dream then the most suitable option to fulfill it will be - by joining a startup (at whatever they pay in the name of salary, provided you get to learn and will learn about your field, working there) initially and after 12 year experience you can switch over. Else if you have thought of joining PSUs by clearing GATE/CAT then, Best of Luck. Civil services, banking and SSC CGL etc. Will be there too if you wish for a government job after 3/4th years. (Though these exams are not a piece of cake to clear, but if your preparation is good then you might easily get into one). Bottom line:
All you need to have is focus in the right direction and patience till you achieve your goal.

It depends on your interests and career plan. The options after B.Sc in Biotech would be to do your Master's degree and then do your doctoral studies if you wish to be in the area of Research or a job in academia. Some options are available for getting a job in the area of Production control or Quality Analyst in organizations such as Biocon, You should be really good with your basics on concepts such as Fermentation technology, Bio-remediation etc. However, its worthwhile doing your Masters and your doctoral studies Ph.D. and then trying for a job. What really matters is your interest and the career plan that you have planned for yourself, whilst understanding your skills and what you are good at.