You need to get a degree in Math, Statistics, or Actuarial
Science.
Then you need to pass (>=) an actuarial exam.
Then you apply, interview and hopefully get a job.
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You need economics,statistics and mathematics.
You can opt for actuarial science as a course or as can do
masters in it . Depending upon the place u want to do it from ,
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Actuarial science includes more than mathematics. For example,
an actuary needs to know that smoking decreases life expectancy,
and that is a medical fact, not a mathematical fact, although it
can be analysed mathematically if you have enough statistical
data.