As you want to get the details of number of attempts which can candidate give for the exam of Graduate Aptitude Test in Engineering so here is the information of the same for you:

According to my knowledge there are no restrictions on the number of attempts for the exam of Graduate Aptitude Test in Engineering

Generally the score card of Graduate Aptitude Test in Engineering is valid for 2 years

GATE 2014 Exam Pattern:

Candidates will be tested on their comprehension and application skills, recall as well as analytical abilities

Candidates will have to answer Multiple Choice Questions and Numerical Questions.
General Aptitude Questions are compulsory for all GATE 2014 exam papers
GATE 2014 XE Paper will have a compulsory section in Engineering Mathematics and General Aptitude along with any two of XE sections B to G.

GATE 2014 XL Paper Pattern will have a compulsory section in Section H in Chemistry and General Aptitude along with any two of XL sections I to M

GATE 2014 Application Fee:

General/OBC-NCL Male Candidates: Rs 1500

SC / ST / PD category Candidates: Rs 750

Women Candidates: Rs 750