Whereas math and physics are basics in the study of electrical engineering, most good schools lay a foundation and build precept upon precept. The depth of material increases with each college year, e.g., the first college year may have the curriculum focus on basic college math Calculus I & II, Algebra I & II, probability and statistics, fundamentals of physics in circuitry such as Ohm's law, Kirchoff's laws, heat waves, electromagnetism, and some programming (C & Java). Subsequent years build on the foundations laid during that first year.
A few individuals (very few) may be able to slack and cram last minute to pass exams but the average person cannot afford to rely on last minute studying. I would encourage that you work steadily and not neglect your studies. Make a habit of going through your material each day. Join a tutoring club if one is available at your school and even later on in college. Do not hesitate to ask for help from your teachers or school guidance office and above all practice, practice, practice.