The National Defence Academy (NDA) is one of the most prestigious gateways for young aspirants who dream of serving the nation in the Indian Army, Navy, and Air Force. Every year, lakhs of candidates appear for the NDA exam, but only a few make it through.One of the frequently asked questions by candidates is – "When is the best time to begin preparing for the NDA?"Let’s understand this with insights from toppers who successfully cracked the NDA.