Emma Kimilainen topped both free practice sessions for the inaugural W Series finale at Brands Hatch on Saturday.
Assen winner Kimilainen set a lap time of 1m23.365s around the midway point of the second free practice session, having also set the pace in the morning in changeable conditions.
Alice Powell ended the day second fastest, just ahead of championship leader and Williams Formula 1 development driver Jamie Chadwick in third. Chadwick had set the second fastest time in the morning session.
Miki Koyama was the first driver to set a lap time in the dry afternoon session, recording an initial benchmark of 1m30.55s, which was quickly deposed by Kimilainen and Chadwick shortly afterwards. Koyama eventually settled in fourth place on the timesheets.
Jessica Hawkins - who is fighting for her place on the W Series grid in 2020 and needs to jump up the points standings from 14th to 12th this weekend - was fifth fastest on Saturday.
Fabienne Wohlwend caused a late red-flag when she ran into the gravel at Paddock Hill Bend in the final five minutes of practice, but had set a time of 1m24.813s earlier on to remain in sixth place.
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Championship contender Beitske Visser was seventh - having run as high as fourth at one point - and almost a second adrift of Chadwick, who will win the inaugural W Series title as long as she finishes on the podium.
Visser had improved from her morning performance, where she ended up last in the field after having completed just seven laps before being confined to the garage with an apparent technical issue.
Sarah Moore was eighth, ahead of Marta Garcia who improved on her final lap to elevate her to ninth and demote Sabre Cook outside of the top 10, with Cook having also caused a short red-flag period due to a spin.
Vicky Piria, who like Hawkins and Cook is in the battle for a crucial top 12 place in the championship, completed the top 10.
Practice one times
Practice two times