Sentence: Bihabha has had post graduation degree from India.

[Sonia*]

I have had a bad cold for last two days.
we have had first round.
Bihabha has had post graduation degree from India.

please let me know which tense is this. what does the combination of

"Has/have + had suggests".
please illustrate full well with some wonderfull instances.

please reply soon.
sonia*

thanks a lot teacher.

[Mister Micawber]

It is difficult to be sure what you don't understand, because you have made several errors. It should read:

"I have had a bad cold for the last two days.
We have had the first round. (I don't know what you mean here by 'round', but I will accept the statement.)
Bihabha has received his postgraduate degree in India.

Please let me know which tense is this. What does the combination of "Has/have + had" suggest? Please illustrate fully with some examples."

'Had' here (like 'received') is the past participle of the verb 'have', and it performs just like any other past participle with 'have/has/had' to form the present perfect and past perfect verb aspects:

Have/has/had gone
Have/has/had received
Have/has/had had.

There is also future perfect: 'will have gone/received/had'. The uses of the perfect aspects are too broad to examine here, but you can start by reading HERE and HERE.
_________________
Native English teacher at Mister Micawber's

[Sonia*]

Hello Mister Micawber,

Many thanks to you sir, I have got your point. Now I have got a little understanding how to use the present perfect tense now I need practice. Thanks a lot sir for providing me the web site for practice.I am happy that you evaluated my writing skills also. Now I guessed where I am mistaking.

Thanks a million sir.
sonia*

[Mister Micawber]

My pleasure, Sonia.
_________________
Native English teacher at Mister Micawber's