Tā xiǎng mán zhù kǎoshì chéngjī, jiǎnzhí shì yǎn'ěr-dàolíng.
Him trying to hide his test scores is sheer self-deception.
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From 《吕氏春秋·自知》: a thief who could not carry off a large bell smashed it; afraid the noise would betray him, he covered his own ears - as if that would silence it for everyone else.
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Picture: hands clamped over your own ears while ringing a bell - the sound still reaches everyone but you. Perfect image of willful self-delusion.