The number of lessons required before taking a LAMDA exam is 10-12 lessons (1 term) depending on the level of the exam and also student's ability) are generally needed on a weekly basis before entering for an exam. I have a 100% pass rate for my students with a Merit or Distinction result.
Students taking the Introductory, Entry and Grades 1-4 generally only require a 30 minute lesson. 2 siblings can split a 1 hour lesson. Students taking grades 5,6,7 and 8 require longer weekly lessons and therefore would benefit from booking a weekly 1-hour lesson. These exams can take 2 terms as the theory is more challenging in these grades, and also Medal Grades (6,7, and 8) are set at the same standard as GCSE, A/S Level, and A-Level exams.