Apa khabar Encik Mokhtar!
You're using M1.9.7 as well? Okay. On my version, the AJAX drag and drop (when moving activities by hand) doesn't work. So I have to manually move them. Do you experience the same thing? It's a known bug in M1.9.7.
So PHP 5.32 is needed for M2.1. Have you contacted your webhosting company yet?
BTW, my PHP version is 5.2.17. And my webshost is SKSA Technology. I'm using a Linux Virtual Private Server, 512Mb RAM. Originally I used a shared hosting package - too slow. So I upgraded to their lowest-end VPS package. Works for a class size of 20+ concurrent users. They can take a quiz with no problems.
[root@main ~]# php -v
PHP 5.2.17 (cli) (built: Jan 7 2011 08:49:48)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
with eAccelerator v0.9.5.3, Copyright (c) 2004-2006 eAccelerator, by eAccelerator
with Zend Optimizer v3.3.9, Copyright (c) 1998-2009, by Zend Technologies