hello, i am sorry to hear that you could not clear Government exams, but there is always hope as there are still many career options left for you to pursue. However, you must devise a career plan. You want to become a data science or analytics, these are two different things once you get into the details of it, Data analytics is more specific and concentrated than data science . Data analytics focuses more on viewing the historical data in context while data science focuses more on machine learning and predictive modeling.

To become succesful in either of these fields,  you must have some key skills in your arsenal ;

• Statistical analysis and computing.
• Machine Learning.
• Deep Learning.
• Processing large data sets.
• Data Visualization.
• Data Wrangling.
• Mathematics.
• Programming.

yes, the pay is good of a data scientist or an analyst but it is not easy to become one .So, if you are confident that you can learn all these and much more. Then you should go for it but since you said you hardly have any computer knowledge, it could be difficult for you. take you time and then come to a well thoughtand evaluated  decision.