how to make the good preparation for the placement exams

Question

i am studying btech[IT] third year in one of the reputed college in coimbatore.my aggregate was 70% currently am in sixth sem.i am confused about the following things regarding my placements 1)i kept backlogs in some of the first year papers and then they had been cleared.now i am without any backlogs.will that cleared papers cause any problems.... is it so then what kind companies i should aim for?2.)i am having 4 months to attend my placements... how could i utilize this time efficiently... NEED HELP....