This subject is carried by Gyan Wallah, his one shot playlist for math is good and in detail, he covers all necessary topics with examples. Do checkout notes of Roshan bist as well in Note Section. Seriously there is no other good videos on this.

Full subject ko idea is this "System of Linear Equation, Matrix and Vector Spaces" are so interrelated and interchangeable. Exam ko perspective bata ekdum detailed ma padhna pardaina yo relationship but full detail ma padhna mann lage chahi 3blue1Brown ko video is good.

Some topics are so repeated in exams like:

Row Equivalent Matrix, LU Factorization
Orthogonality and Least Square
Null space and Col space

Initially yo topic haru bujhna time lagcha naya bhayera tara once familiar tyesto hard feel hudaina.

We are working on this.

Question Papers (with answers) will soon be available