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If you have studied Telugu all the way through schooling then you should prefer Telugu as your second language but the scope of Telugu is limited to Telangana and Andhra Pradesh state, it is also a scoring subject. Hindi on the other hand has scope across India and the easiness or difficulty level depends on your ability you should assess yourself based on the fluency and ability to study Hindi subject. Sanskrit is an easy scoring subject but the demand is less when compared to Hindi, you should consider taking Sanskrit if you want to score well. You know your abilities well so make a list of areas of your strengths and weaknesses with respect to the subjects and take a decision.
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