@Sun,

First, You should setup meta format in Unity Editor'setup
1.Open Editor setup
2. Change or Check "Version control mode" and "Asset Serialization mode" ("Visible Meta file", "Force Text")
3. Now close Unity3D and open the "Explorer" and Go your source's path. 
4. Remove not necessary folder and files (You need just 2 folders "Assets" and "ProjectSettings" (I just compress it. however, you can move these folders to other media)
* Please let me know what you block something.

We had to meet Drawcall problem in Mobile game developing using unity 3D.
You should solve it by 2 combination way.

1. Make shard material.
2. Combine mesh.

I writing down about "Combine mesh"

1. Make next script as CombineChild on Unity3D

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(MeshFilter))]
[RequireComponent(typeof(MeshRenderer))]
public class CombineChild : MonoBehaviour
{
void Start()
{
Matrix4x4 thisTransform = transform.worldToLocalMatrix; 
MeshFilter[] meshFilters = GetComponentsInChildren<MeshFilter>();
CombineInstance[] combine = new CombineInstance[meshFilters.Length];
int i = 0;
while (i < meshFilters.Length)
{
combine[i].mesh = meshFilters[i].sharedMesh;
combine[i].transform = thisTransform * meshFilters[i].transform.localToWorldMatrix;
meshFilters[i].gameObject.SetActive(false);
i++;
}
transform.GetComponent<MeshFilter>().mesh = new Mesh();
transform.GetComponent<MeshFilter>().mesh.CombineMeshes(combine); //, true, true, true);

transform.GetComponent<MeshFilter>().mesh.RecalculateNormals();
transform.gameObject.SetActive(true);
}
}

2. and Please attach to parent gameobject.

Cheers

first time, Update the code in iTween.cs file

void CallBack(string callbackType){
if (tweenArguments.Contains(callbackType) && !tweenArguments.Contains("ischild")) {
//establish target:
GameObject target;
if (tweenArguments.Contains(callbackType+"target")) {
target=(GameObject)tweenArguments[callbackType+"target"];
}else{
target=gameObject; 
}

/// Start of update
if (tweenArguments[callbackType] is Action<object>)
{
((Action<object>)tweenArguments[callbackType]).Invoke((object)tweenArguments[callbackType + "params"]);
}
else
/// End of update


//throw an error if a string wasn't passed for callback:
if (tweenArguments[callbackType].GetType() == typeof(System.String)) {
target.SendMessage((string)tweenArguments[callbackType],(object)tweenArguments[callbackType+"params"],SendMessageOptions.DontRequireReceiver);
}else{
Debug.LogError("iTween Error: Callback method references must be passed as a String!");
Destroy (this);
}
}
}

Now, You could use the Action<T> delegate in iTween.

iTween.ValueTo(gameObject,
iTween.Hash(
"from", 1f,
"to", 0f,
"time", 1f,
"onupdate", (System.Action<object>)(x => { missedInfo.color = new Color(1f, 0f, 0f, (float)x); }),
"oncomplete", (System.Action<object>)(x => missedInfo.gameObject.SetActive(true))
)
);