Brookes leads Shane Byrne by two points and Tommy Hill by 22 ahead of the weekend's even at Silverstone.
The Tyco Suzuki rider hopes to hold off two-time champion Byrne and his other rivals
"We have a two-point lead but that doesn't mean much when it's so close," said Brookes.
"I have had great results at Silverstone before so hopefully we can put on a good show again for Tyco Suzuki.
"It’s been an exciting Showdown for me so far and sure it is for the fans too."