MSW

At the PG level, Rani Channamma University Belgaum, Karnatka provides a 2 years Master of Social Work course to the students. To get admission to this course, aspiring students must meet the minimum eligibility requirements-Candidates passed BSW/BA/B.Sc/B.Com/BCA/BBM/LLB from any recognized institute/university are eligible to apply.

Placement- The Median Salary for Master in Social Work is   INR 3.46 Lakhs.

Here are some elective subjects covered in the Master of Social Work syllabus. 

Note - The information is taken from external sites and may vary.

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MSW Degree Syllabus

Of course you can. See the following table for some more details on different MSW course modes offered in India.

Note - The information is taken from the official website.

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MSW Degree Course 

In order to be admitted to the MSW programme at Dr. Abdul Haq Urdu University an applicant has to qualify the admission criteria including possessing a relevant undergraduate degree and passing the university admission test. Despite it is not very competitive, there are set standard of academics and application that a candidate has to meet to gain admission.

To take admission in MSW  at Dr. Abdul Haq Urdu University you must need to clear eligibility criteria and pass the Andhra Pradesh PGCET entrance exam. And undergraduate degree with 50% aggregate marks.

Yes you can pursue MSW course after BTech. This is because the minimum eligibility criteria to pursue MSW is that you should be a graduate. You should also have secured at least 50% marks or 5.5 CGPA in BTech to be eligible to apply for the course. You could have graduated in any branch of BTech.
You can apply for the course through entrance exams to get MSW admission in good colleges.
Since MSW is an arts course you may have to change your learning approach to pursue this course. 

No there is no age limit to pursue MSW course so you can pursue this course at any age. Make sure that you satisfy other eligibility parameters such as academic qualifications, marks criteria and appearing and passed criteria. 
Most colleges and entrance exam conducting bodies do not prescribe any age limit. However, some colleges, especially private colleges may have their own eligibility criteria that you may have to satisfy. A valid reason for year gap may also be required in some colleges.

MSW is the abbreviation of Master of Social Work course whereas MSSW is the abbreviation of Madras School of Social Work. The MSW course is offered in many colleges in India including MSSW. 

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MSW Degree Course 

Yes you can pursue MSW course or Master of Social Work course without pursuing a BSW or Bachelor of Social Work course. You should be a graduate to pursue MSW. Make sure that you have secured at least 50% aggregate marks to be eligible to apply for the course. Also ensure that you have studied from a recognised institute. It is not compulsory that you should have completed BSW course to pursue MSW though BSW graduates would be able to better understand cencepts covered MSW course. 

The entrance exam scores accepted by Social Sciences Centre (M.S.W.) Bharati Vidyapeeth for admission to MSW are based on the Common Entrance Test (CET) conducted by the Centre . The CET is followed by Group Discussion (GD) and Personal Interview (PI) rounds . A merit list is prepared after the above process, and candidates are selected based on their performance . Additionally, the Centre also accepts scores from BVP CET .