Gangjee was six-under 207 at the USD three million event.
The only other Indian left in fray over the weekend, Gaganjeet Bhullar (71), was tied 25th at four-under 209 after bogeying the 18th for the third straight day.
Gangjee and Bhullar are the only Indians to make the cut from a total of nine who teed off on Thursday.
Korea's Soomin Lee fired nine birdies for a sparkling seven-under 64 and a three-shot lead over Australia's Marcus Fraser (66) as overnight leader Nathan Holman (73) slipped to third following a triple bogey on the last hole.
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"The difference between yesterday and today was hitting. It seems as long as I put myself in a position to make birdies, I will probably make it. This course requires you to hit it both ways off the tee. Also I have been able to get myself out of some sticky situations last three days. Just need to stay focused in the final round."
Gangjee, who has been having steady finishes since Hong Kong Open last year in October, has made all three cuts this season.
Filipino rising star Miguel Tabuena, Japan's Masahiro Kawamura and Jorge Campillo of Spain share fourth place on 203, five shots off the lead.
Thongchai Jaidee of Thailand withdrew from the penultimate round of the event due to illness.