Steps for solving Holding Co & Amalgamation problems

Hi, I need to know all the required steps in detail, for solving sums, for each and every type of adjustments in Holding Co (i.e, Consolidation of financial statements) so that I can start solving problems rightaway. I am also looking for a large collection of tough and comprehensive problems/sums on Holding Co and Amalgamation, for ample practice for the final. Please help.