Most students don't actually find the junior maths theory hard. But, they find the algebra hard, so they make lots of silly mistakes in their working. Algebra is the key in getting high marks in junior high school. So I heavily focus on establishing fluent algebra skills.
(1) Students must master maths, especially algebra, when they are young, ideally from from Year 4 to Year 8. If they miss this window, then it is too late and eventually, these students must study the HSC with a heavy handicap in algebra.
(2) Students must practise maths everyday. So, I use the 'Maths Everyday' system. I set a small amount of homework for the student to complete each day. Then I check every day whether the student has done the homework.
(3) Students must know what they are doing with clear intent. To help students, I teach them analogies and metaphors to help them understand the overall picture. I also use my own schemas to help students map out the path they should take to the solution.
(4) It is well known that students learn best when multiple senses are engaged. But strangely, many tutors just focus on writing with pen and paper. I use audiovisual techniques to help students learn better and faster.