How are you going to help your child recognise how to do multiple choice questions? The answer is you set some rules.
Read the question and try to decide if the question is identifying something you know something about. This could help.
Don’t expect an expert eleven plus examiner to give away the answer. You, and your eleven plus child, may have to work for you answer.
Look closely at the question and try to see if there is any superfluous or irrelevant detail.
Are there any negatives in the question?
Can you recognise, and find, the distracters easily?
Can you bear to reject the obvious distracters?
How your child will remember the five points to identify the five key words
This then shortens down to:
G S N D R.
Try a few challenging questions together. Apply the five point rule. See if anything helps.