Fabio Quartararo isn't doing a very good job of lowering expectations heading into his debut Moto3 grand prix season.

Riding for reigning world champion's Estrella Galicia Honda, the 15-year-old Frenchman has been fastest overall at both official 2015 tests.

A dry day one lap had put the reigning Spanish CEV title winner on top at Valencia, while Jerez this week saw the opposite kind of weather - improving as the test went on. Quartararo duly led days two and three, culminating in a lap time half-a-second under Jack Miller's official pole record.

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"I'm very happy with the work we have done during these three days of testing at Jerez, where the weather has been better than at Valencia," Quartararo said. "We have spent the three days working on the setup of the bike.

"Today has been very positive for the team, because we have focused on working with the first race of the World Championship in Qatar in mind and I am very happy with the results. I have to thank the whole team, because we have worked very well together."

Aspar Mahindra's Jorge Martin was just 0.013s slower for a rookie one-two, while Quartararo's team-mate Jorge Navarro sealed the sixth fastest time (+0.758s).

"These three days have been very positive for us, since the good weather allowed us to put in many laps and try many things out on the bike," said Navarro, heading into his first full season after 12 previous GP starts. "I personally focused on finding my own pace, without using a slipstream or references, because what we wanted was to analyse the behaviour of the bike with every change we made.

"The truth is that we have found a pretty good base, but we still have work to do with used tyres. We know the points that we need to improve on with both the bike and my riding, and at the next test I hope to be better prepared."

Just one more official test remains, back at Jerez in mid-March, prior to the Qatar season opener. A change in the rules means that, as the reigning CEV champion, Quartararo can race the full season even though he is not 16 until April 20.