PDF text is great, but Mandarin is a tonal language. Pair your PDF study with audio apps or videos to ensure correct pronunciation [1].
Look at the Chinese characters. Draw them in a notebook. Use the Tamil instructions for stroke order. Associate the character's shape with a Tamil visual mnemonic. For example, the character for "person" (人 - Rén) looks like a walking stick; imagine a Tamil "மனிதன்" leaning on it. Learn Chinese Through Tamil Pdf