1.How smooth and fast can I get a divorce mentioning all these?
Grounds of impotency:-
THE HINDU MARRIAGE ACT, 1955; ACT NO. 25 OF 1955
12. Voidable marriages.
(1)Any marriage solemnized, whether before or after the commencement of this Act, shall be voidable and may be annulled by a decree of nullity on any of the following grounds, namely
(a) that the marriage has not been consummated owing to the impotance of the respondent.
Most probably your husband is Impotent. You immediately file a petition for nullity (not divorce). It is time bound. When one is confirmed that her husband is impotent she should apply immediately, - time barred.
Choose a lady advocate and file the nulty petition through her.
His stand will be that as you was always fighting and that’s the reason he was unable to perform.
Do not worry for that.
2.What kind of test will be taken to prove his impotency?
Ejaculation test; not fertility test.
4.Should I produce the test reports taken already which confirms that he has low Testosterone level or should I get any certificate from the Dr we consulted inorder to safe guard me?
Yes of course. It will help to stand the case prima facie.
3.Is it possible to take any tablets before the test and prove that he is fit and he has no problem so that he can drag the divorce process and torture me more?
Yes.
After filing the petition, or in your nullity petition, request for a medical test of the husband and request the court that the test should be in presence of your doctor. If he has courage and confidence he will oppose the petition with a plea of medical test. If he avoids the court then you will get ex-party decision. In your Petition you mention the doubt about medicine.