BROOKLYN - The number of teachers meeting federal performance standards in Brooklyn and the rest of the state is on the rise.The No Child Left Behind Act mandates that teachers must meet certification standards for their subject areas and show they are knowledgeable in the content they teach. The latest statistics show 87 percent of teachers were deemed qualified under federal requirements, an 8 percent increase from the previous year.There are still teachers in certain subject areas lagging behind, which could mean the loss of millions in federal aid. More than 50 percent of earth science teachers and 30 percent of art teachers are still deemed to be not qualified in their subject area. Education officials in the city say the jump in teacher quality is due in part to improvements in recruiting and teacher incentives.