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Scars have got treatment. You can get it treated and go ahead for the recruitment process. You have scored well in class 12th and that means you are good at studies also. You may proceed ahead with this course. In general Candidate Profile for Freshers for cabin crew is as under:
Age: Between 18 and 27 years
Minimum Height: Men - 170 cms and Women - 157 cms
Weight: In proportion to height
Educational Qualification: SC (10 + 2). Candidates who are appearing for their HSC examinations can also apply
Physical features: Pleasing personality, clear complexion (scars, pimples and blemishes not acceptable) and good eyesight
Marital Status: Unmarried
Language skills: Fluency in English and Hindi. Proficiency in a foreign language will be an added advantage. Interactive skills: Excellent communication and good interpersonal skills
Nationality: Indian citizens only
Passport: Must possess a valid Indian passport or should have applied for a passport
Mandatory Documentation: Must possess a Pan Card and Aadhaar Card
So, that becomes very clear that it merely requires some grooming to get the job of a cabin crew. They don't demand much from candidates. You should be interpersonal sound and capable to handle people from different cultures. Cabin crew is the face of the airline. Coz they face the passengers for the first time. Foreign languages like German, French, Russian, Arabic, Chinese and Japanese, Can allow you to get an edge over others. As this allows the airline to roster you on routes where such languages are spoken.

M.Sc is more like a degree for pure sciences. M.Sc Physics, Chemistry, Maths, Botany, Zoology. There is also M.Sc Computer Science in some Universities. These are typically good for folks who wish to pursue a career in academia or those who wish to do PhD's or MPhil's. I've also seen some folks do a MBA later if they change their minds and join the industry. I've also seen some people with M.Sc. Chemistry who ended up in Chemical & Pharma industries. There's also M.Sc. Pathology where people pursuing this course land up in Pathology labs or Pharma companies. MS is more like a professional course that will be more industry focused. IIIT Hyderabad (Welcome to MSIT programme) has one, I recommend you check out M.Tech courses too. BITS Pilani has a distance learning course for working professionals which has been there for almost 30 yearshttp://www.bits-pilani.ac.in/uni. IIT's have M.Tech courses too which are best in the industry. You need to give the GATE exam and submit the score to join MS/M.Tech courses in India. Hope this helps.