1. By consent of both sides, all the writ petitions are taken up for final disposal.

2. Since the issue involved in all these cases are one and the same, all the writ petitions are disposed of by this common order.

3. The common prayer in all these writ petitions are for issuing a writ of mandamus directing the respondent to treat the petitioners as passed in the Group-I Services Preliminary Examinations 2006-2007 conducted by the respondent on 212. 2007 by rectifying the wrong key answers assigned to question Nos.118, 133, 140, 143, 152, 167 & some other questions and permit them to write the Group-I main written examinations scheduled to be held on 18. 2008 and 18. 2008.

4. The facts in nutshell that are necessary for disposal of all these writ petitions are as follows:

.(a) The case of the petitioners in all the writ petitions is that the respondent TNPSC issued a notification on 8. 2007 and invited applications for direct recruitment to the vacancies for the posts included in Group-I Services 2006-2007. The said notification was issued after a gap of seven years. Total number of vacancies notified are 178, distributed among posts in various categories. Petitioners