You don't have to know anything . unless of course you'd like to pass. This question would be better directed to your teacher. We have no idea what's going to be on your test. Well,
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Introduction for summation: Summation is the operation of combining a sequence of numbers using addition; the result is their sum or total. An interim or present total of a summation
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Take the limit of the (n+1)th term into the nth term: r = lim(n→∞) [1+2(n+1) x^n+1)/(1+3(n+1) / [1+2n) x^n/(1+3n). x * lim(n→∞) (2n+3)3n+1)/[2n+1)3n+4) 
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Teachers developed three main activities to make their summative tests useful in giving feedback for learning:
http://www.standards.dfes.gov.uk/research/themes/a...
