First of all I will safely Assume that by RC you mean CR instead,i.e Critical reasoning.
My assumption is based on the Question types you have mentioned here.
Secondly,I presume you have not yet gone through Logical Reasoning Bible by Power score.If that be the case,please do read these chapters.
Thirdly,the book mentions specific Tests for eliminating the wrong answers.For example, you can use negation Technique on an answer option, for a strengthening type of question.If you closely focus on the Argument conclusion,you will find that by using this test on a CORRECT option it will Weaken the conclusion instead.hence the option is the correct answer.
Similarly,you can use Polar Opposite Answer technique Yes/No for Argument evaluation.
Point is all such tests help you to pin point the right answer.
Finally, you can share some question here at the CR forum.We will answer them and develop a cooperative learning platform,benefiting all of us.
I hope this helps.