Once I used my 6 months or 1 year subscription, can I renew it to get it again
Hi Anshu 
Yes! you can renew your subscription to the GitHub Student Developer Pack by following the same process you did to get the benefits.
If you need more information about this process you can follow this guide: https://docs.github.com/en/free-pro-team@latest/github/teaching-and-learning-with-github-education/applying-for-a-student-developer-pack
Best,
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