First of all you have to abide by this simple rule and except this you can retake GRE test as many times as you want.
You can retake GRE test after every 21 days and five times in a year. There is no lifetime limit for taking GRE test.
Now as per your question, how can you retake the GRE exam?
Retake of any one section separately is not allowed, you need to retake / Re-Attempt the entire GRE test instead.
Practice GRE General Test online for free