Erik Jacobs for The New York Times; illustration by Stephen Webster (A.P. bio material)THE NEW A.P. Caroline Brown, an A.P. student at the Bancroft School in Worcester, Mass. 
WHEN Joan Carlson started teaching high school biology more than 30 years ago, the Advanced Placement textbook was daunting enough, at 36 chapters and 870 pages. But as an explosion of research into cells and genes reshapes our sense of how life evolves, the flood of new material has been staggering. Mrs. Carlson’s A.P. class in Worcester, Mass., now confronts a book with 56 chapters and 1,400 pages, along with a profusion of animated videos and Web-based aids that supplement the text.
Advanced Placement is being redesigned to test more conceptual understanding. Click below for examples of the types of questions that will be found on the new U.S. history and biology tests.
IN THE LAB Looking to bring the “Oh, wow!” factor back to science. Above, at the Bancroft School, which was selected by the College Board to try out new A.P. experiments. And what fuels the panic is that nearly every tongue-twisting term and microscopic fact is fair game for the year-end test that decides who will receive college credit for the course.
“Some of the students look at the book and say, ‘My gosh, it’s just like an encyclopedia,’ ” Mrs. Carlson says. And when new A.P. teachers encounter it, “they almost want to start sobbing.”
As A.P. has proliferated, spreading to more than 30 subjects with 1.8 million students taking 3.2 million tests, the program has won praise for giving students an early chance at more challenging work. But many of the courses, particularly in the sciences and history, have also been criticized for overwhelming students with facts to memorize and then rushing through important topics. Students and educators alike say that biology, with 172,000 test-takers this year, is one of the worst offenders.
A.P. teachers have long complained that lingering for an extra 10 or 15 minutes on a topic can be a zero-sum game, squeezing out something else that needs to be covered for the exam. PowerPoint lectures are the rule. The homework wears down many students. And studies show that most schools do the same canned laboratory exercises, providing little sense of the thrill of scientific discovery.
All that, says the College Board, is about to change.
Next month, the board, the nonprofit organization that owns the A.P. exams as well as the SAT, will release a wholesale revamping of A.P. biology as well as United States history — with 387,000 test-takers the most popular A.P. subject. A preview of the changes shows that the board will slash the amount of material students need to know for the tests and provide, for the first time, a curriculum framework for what courses should look like. The goal is to clear students’ minds to focus on bigger concepts and stimulate more analytic thinking. In biology, a host of more creative, hands-on experiments are intended to help students think more like scientists.
The changes, which are to take effect in the 2012-13 school year, are part of a sweeping redesign of the entire A.P. program. Instead of just providing teachers with a list of points that need to be covered for the exams, the College Board will create these detailed standards for each subject and create new exams to match.
Trevor Packer, the College Board’s vice president for Advanced Placement, notes that the changes mark a new direction for the board, which has focused on the tests more than the courses. The rollout of “the New A.P.,” as the board describes it, will actually start this year with a new curriculum taking effect in two smaller programs, German and French language. Major revisions to physics, chemistry, European history, world history and art history will follow, with the hope of being ready for exams in 2014 or 2015.
“We really believe that the New A.P. needs to be anchored in a curriculum that focuses on what students need to be able to do with their knowledge,” Mr. Packer says. A.P. teachers made clear that such a shift was impossible unless the breadth of material covered was pared down. Courses in English and math are manageable, Mr. Packer says, and will not be revised until later.
The new approach is important because critical thinking skills are considered essential for advanced college courses and jobs in today’s information-based economy. College administrators and veteran A.P. teachers familiar with the new biology curriculum believe the changes could have significant reverberations for how science is taught in introductory college classes and even elementary school classrooms, and might bring some of the excitement back to science learning.
“I really think this is a game-changer,” says Gordon E. Uno, a botany professor at the University of Oklahoma who has helped plan the biology changes.
Christopher Drew is a reporter for The Times.
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