Do you need a revision material for solely Second Conditional clauses? Here's a consolidation worksheet that focuses on Second Conditional clauses' form and meaning.
In this worksheet, students are asked to read a situation and then write an appropriate Second Conditional sentence according to that given situation. Different answers may be possible for each situation as there may be different interpretations of each case. If different answers come up, ask for a class opinion for those answers. It'll be a good opportunity to consolidate the meaning of Type 2 if clauses.
There's also consolidation worksheet on first conditionals, which might be useful if you want to compare the two clauses.