Chinese · Pronunciation Guide
jahng with the tongue curled back and no puff of air, held high and level. The ending is the deep nasal of "song", not a front n.
zhāng
Level and immovable. As a measure word it shapes its neighbours: 一 in front becomes a falling yì, and third-tone numbers before it keep their dips intact because 张 is not a third tone. It is also an extremely common surname, where the same tone and pronunciation apply.
Listen: 张
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桌子上有一张纸。
Zhuōzi shàng yǒu yì zhāng zhǐ.
There is a sheet of paper on the table.
Listen: 桌子上有一张纸。
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桌子上有一张纸。 gives you a lot to track. Zhuōzi is high plus toneless; shàng falls; yǒu dips; yì is the converted form of 一 before the first-tone zhāng; and zhǐ ends the sentence with a full third tone. Notice zhuō, zhāng and zhǐ all use the same retroflex initial, so the sentence is a natural drill for keeping the tongue curled.
The retroflex is the main casualty: English speakers produce the j of "John", with the tongue flat and the sound voiced, which drifts toward the palatal j of Mandarin — a genuinely different consonant. Curl the tip back until the sound feels muffled. The nasal ending is the second issue: zhāng with a front n becomes a different syllable, and English speakers merge the two nasals unless they are actively listening for the difference.