How do I improve my PSAT score 182 to 220ish to get National Merit?

<p>How do I improve a score of 182 PSAT to around 220 to qualify to National merit? I have about 4 months to study before my junior PSAT. Sidenote: I got a 160 freshman year and took about 4-5 practice tests and raised it to 182. Should I just keep taking CB tests or take a different approach? Please give me instructions as detailed and specific as possible because I am pretty stumped right now. Thank you.
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<p>Read through the pinned threads starting here (<a href=“Everyone, read this before posting: Best of SAT Prep Forum and FAQs - SAT Preparation - College Confidential Forums”>http://talk.collegeconfidential.com/sat-preparation/763933-everyone-read-this-before-posting-best-of-sat-prep-forum-and-faqs-p1.html&lt;/a&gt;). </p>

<p>Work through Silverturtle’s guide and you’ll be set. Taking more CB tests and understanding your mistakes will really boost your score. </p>