Regarding Eligibility criteria

Hello, I have applied for assistant grade 3 exam. In this exam eligibility criteria that had been published in Feb 2015 in MP gazette according to General Administrative dept of M.P., those were as follow: 1.higher secondary pass 2.in Cpct Certificate {computer 38/75 marks and hindi typing 30wpm} (whether in this test, english typing test is also taken, but about English typing there were no rules were prescribed in mp gazette in Feb 2015). after this in sept 2016 notification has been published by MP PEB for Asst grade 3 exam recruitment, as this notification was published by MPPEB and application form submission is done by mponline's portal (provides online services to MPPEB) so the eligibilty criteria were in online application were same as mp gazette's feb 2015, but after four days of the process of application submission MPPEB released a press note that says 'now only cpct score card is valid' but in that there were no information regarding english typing speed (however, it is written in cpct score card that score card can be read in many ways like only computer pass only hindi typing pass or only english typing pass or hindi typing and computer pass or hindi typing, english typing and computer proficiency pass). after the examination (18dec 2016), 24 jan 2017 GAD published a revised note for feb 2015 gazette that dictates 'now computer proficiency, hindi typing 20wpm, english typing 30wpm pass is essential' but still it hasn't been published in mp gazette. Actually, I passed only computer proficiency and hind typing 30wpm. when i filled application on mponline portal, there were one option was "have you cleared cpct hindi typing and computer?" Just because of it I gave preference to the assistant grade post though there were some vacancies without cpct(only 12th basis) also present. Now, my query is 1.Is this lawful and legal that eligibility criteria changes can be done after the process of application filling starts? 2. Is this lawful and legal in this case that 24 jan 2017 revised notification's eligibility will be allowed and aplicable in the previous recruitment while there was noting mentioned previously about english typing speed? 3.If I go to high court then what are my chances to win document verification issue or preference resuffling? Thanks Neha Sharma :)