Tā píngjiè zìjǐ de nǔlì kǎoshàng le míngpái dàxué.
He got into a top university by relying on his own hard work.
Tips
usage
Variant orthography of 凭借 - same word, same pronunciation, just an older / more literary spelling of the second character. Modern editing standards prefer 凭借; you'll see 凭藉 in older books, formal documents, and Taiwan/HK texts.
grammar
Functions as a preposition introducing the means or basis: 凭藉 + NP + VP. Compare with 依靠 (more on people) and 借助 (more on tools/help).