Question

GATE COMPUTER SCIENCE PAPER 2 WAS TOUGH COMPARE TO PAPER1 AND 3?

Answer 1

Just wait some more days to get the official confirmation of normalized marks once keys are published. But as per the results, papers 1 and 2 were tougher than 3 on an average. But average is quite often not a good metric as is here.

Comments

according to gateforum  key I got 26 in papaer 2 of computer science but normalized marks 19.34.if paper 2 tough then marks should be higher

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Sorry to say. But you have no right to believe any key other than official one released by GATE. For reason you can see here:

http://gatecse.in/wiki/GATE2015-2_Keys

Now when official key comes, these keys become unnecessary. 

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official confirmation of normalized marks means?

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how much mark that was increased or decreased per session. We can know only when actual marks or official keys are out.

Answer 2

Set1, Normalized marks = 1.0638 * Actual Marks + 1.810
Set2, Normalized marks = 1.0660 * Actual Marks - 5.172
Set3, Normalized marks = 0.9410 * Actual Marks + 2.270

So, as per the marks scored by students, Set 1 is the toughest and set 2 is the easiest.