Hello Pradheep,
If you go to this url
uni5.co/index.php/en/uni5-schools?tp=1 you will see your available template positions displayed. You only have a few.
top
slider
left
right
bottom
footer
Those are the only module positions where you can place modules. The very center is the mainbody position, and it is used for articles.
If you are placing modules in these positions and nothing is showing first check your configuration.
Go to the module manager and see if all of the modules you need are enabled.
In the module manager check the position of each module and if it's not assigned to one of the module positions listed above, open the parameters and move it to one of these positions.
Check all the module configurations and look to see how they are assigned to the pages. Your choices are to "show on none" "show on all" or "show on selected". Make sure the modules are assigned to the pages you want them.
Assuming that the content of the modules is standard and not some form of php code that would be stripped by Joomla, then everything should work just fine.
If it doesn't you have a serious problem with that template and need to contact the people you bought it from. They will know best how to fix it or could give you a new copy if there is something wrong with that one.
The fact that it stopped working when you changed templates says it's not a Joomla problem, but a template problem.
Check all your settings and let us know what happens.
Cheers,
Ed