any good Strategy to solve bold face questions!!!

In simple terms, you can follow the following steps :

1) Read the argument and identify the premises and conclusion.
2) Take each bold face at a time. Scan through the choices and eliminate the choices which are absolutely wrong. (eg Bold face 1 is a premise => Eliminate choices that list bold face 1 as conclusion).
3) Repeat step 2 with the other bold face portion.
4) If there are still multiple options remaining, read the options closely and determine the choice which identifies the role of both the bold faces correctly.
Conclusion category: Claim, prediction, objection, judgement etc
Premise category: Observation, findings, evidence, information etc.

This simple technique will help you improve your accuracy with 600-700 range bold faces.