It seems that you want either job or gate preparation not both, if you are getting job in an product based company then take it, if not then do prepare for gate, first strategy is to clear you university exam with maximum marks possible this would be last sem to increase your marks and it do effect your gate admissions, after exam is over you will be relaxed as you have completed engineerig, but no time for celebration you have to start preparation as soon as possible, you might not be able to recollect any subjects of gate becuse you said you did it just to pass exams, learn concept, joining coaching is purely your decision, here is link to tell you that you should join coaching or not http://gatecse.in/coaching-for-gate/ , till october you have time to just learn and solve previous year question of gate, after october join test series as many as you can, you day should consist of test, test analysis, idetifing mistakes, making notes and revision of previous subjects till mid jan, after mid jan till gate exam you should just focus on how to write paper, preparing strategry for writting exam, managing pressure this can be done by giving full length test of various test series, take them seriously. give exam.
here are some links which will help you
http://gatecse.in/best-books-for-gatecse/
http://gatecse.in/i_want_to_crack_gate_in_cse/
