Florida lawmakers could overhaul the state’s testing system this year, cutting the number of exams students take and reducing the impact it has on public schools. Or they could tweak it, shifting testing to later in the school year and studying whether national exams — such as the ACT and SAT — could in a few years be used in place of Florida’s current series of two dozen standardized tests. The Senate and House each have proposals, but they are far apart in both scope and details.