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Before you go into the details of requirement for forensic science careers, it is important that you have the following skillset for this field.
1. Good hold on science subjects (especially biology and chemistry).
2. An enquiring mind.
3. High degree of accuracy and attention to detailing in your nature of work.
4. Observation skills.
5. Patience.
6. Able to work under pressure for long hours and team spirit.
These skillsets are the basic requirement for every aspiring forensic scientist.
What you do on the job?
You would be using your knowledge of science to analyse the evidence found at a crime scene.
Analysis could be anything from an object at the crime scene, to soil, blood stains, saliva, bodily fluids, bones, fingerprints, DNA profiling, recovering data from computers, researching new techniques/technology, etc.
You generally work in a lab and the results you analyse are then used to help solve cases and catch criminals.

If you are not interested in computer languages and computers, I don't recommend B.Tech in CSE or IT because in today's world there is a huge crowd of students in CSE and in near future there will be very tough competition in IT field.
So, think twice before taking CSE or IT.
Keep the below mentioned points in mind:
1. In most of the colleges first of all CSE seats are filled.
2. Most of the girls do engineering only in CSE, IT or ECE.
3. Intermediate commerce students have the option to do BCA, which makes IT field more competitive.
4. Almost each student wants to become computer engineer to get high package.
5. Other engineers like civil or mechanical also have the option to make career in IT field.
From all these points we can conclude that how much crowded is IT field, irrespective of the fact that IT is a vast field.