What type of entrance exam will be there to join a MA in psychology ? N how many vaccancies are there to enter into merit for this course?

Yes, you can go for psychology even after BA Sociology. Few universities conduct entrance exam such as NIMHANS, LPUNEST,DUET,NET TISS etc. where as in few you can apply for direct admission.

Psychology courses are:: MA Applied Psychology,MA Counselling Psychology,MA Hons. Psychology,MA Philosophy & Applied Psychology,MSc. Psychology,Msc Psychologocal Counselling

The best Universities are:           Delhi University (New Delhi), Jamia Milia Islamia (New Delhi),Tata Institute of Social Sciences Mumbai, Lovely Professional University(Punjab) , Banaras Hindu University (Varanasi)Aligarh Muslim UniversityIndian Institute of Psychology and Research, BangaloreChrist University, BangaloreAmbedkar University (New Delhi)Sophia College for Women, MumbaiBheem Rao Ambedkar College, DelhiMount Carmel College, BangaloreLoreto College, KolkataMadras School of Social Work, Madrasresidency College, ChennaiFergusson College, PuneUniversity of Lucknow,Indian Institute of Psychology -Noida,Ambedkar University (New Delhi)

If you have successfully competed Your Bachelor and training in psychology then you can make your mark and pursue a career as a psychologist as: Clinical psychologist.Counselling psychologist.Educational psychologist.Forensic psychologist.Further education teacher.Health psychologist.High intensity therapist.Occupational psychologist.

The admission and eligibility critera vary college and university wise and the intake exam and number of seats vary accordingly too so please tell which one you are asking for?