'Discovering the world of EDS' by Mian Shafiq published by Jahangir Publishers is the best one. It is for subjective part. For Objective, buy a booklet of the same author and same publisher. You will find solved past papers, objectives, abbreviations etc. Both are more than enough.

If not, buy Akram Kashmiri's EDS book. Both the above-mentioned sources are recommended ones.

__________________
"But screw your courage to the sticking place,
And we'll not fail." _Shakespeare, 'Macbeth')