It is important to clarify from the outset: is not a widely recognized standard textbook in the Japanese learning community (like Genki, Minna no Nihon, or Tobira). Searches for a specific "PDF 22" or "Portable" version often lead to dead links, user-uploaded content on file-sharing sites, or mislabeled resources.
Once you have mastered the 22 points, your grammar is no longer weak. However, to reach fluency, you need to move from knowing rules to automatically applying them. bunpou ga yowai anata e pdf 22 portable