i dont think u really need to know that. all u need to know according to the syllabus in terms of ur question is the strengths and weaknesses of political, behavioural and classical management theory.
but for systems theory - since it is a system of unified parts i guess u could say that its weakness is that where one department fails so does other departments. the strengths with this is that (im guessing here) they focus on every aspect of the business so that everything works efficiently and effectively.
for contingency theory - it states that it involves finding the best possible solution out of many alternatives. i believe that its meaning is a benefit all in itself. dont know bout any weaknesses though
for total quality management (TQM) i guess u could say that its strength is providing the very best product to its customers but the weakness is that since there is so much focus on the product itself, there is less focus on other things like the financial department, and in turn there is the likely chance of increase expenses due to less monitoring