If google crawls my site too much did that improve my site rank and my web to be indexed in google and how i can set fast crawle rate
You can increase your crawl rate from Google Webmaster Tools, but I recommend you just leave it a s is. Patience.
There is nothing you need to do on this topic to improve your indexing or SEO. Google knows what they are doing. Just keep adding new content and make daily changes (minor) to your home page. G will take care of the rest. On a large site, a weekly XML sitemap helps via Webmaster Tools.
If you set to index your page daily and update your site monthly, Google will not like it. Patience and even more patience. Gather backlinks.
Get quality links to improve ranking. Faster crawling doesnt mean your site can come improve ranking.
You only need to speed up the crawling if the content is changing quickly in which case the googlebots will be staking out your website in anticipation!
It only helps you to keep Google updated about your website if you changed a page content or uploaded new content. Also, It makes it faster to see how your changes and your new content works with your SERPs
Google crawls a site if it finds a new content in it. To improve your ranking, spend more time in building quality links for your site.
Google crawls on for new content / information. For new position / better ranking, look into Seo. Have a look here : http://forums.digitalpoint.com/showthread.php?p=10915422#post10915422 Br Seo_genius
If you update your site daily, or a few times in a day, on regular basis than google will spot it out shortly and will start crawling youe site regularly. However, regular crawling will not improve page rank. For that get quality backlinks with targeted anchor keywords.