is your basic accounting concepts are clear? i mean debit credit asset libility and other accounting concepts which we had study in cpt, because they are base for any further accounting study .
if yes then there may be problem of less practice . accounting demands practice. You should practice questions covering all the concepts. but you should not ignore theory because they tell us what is purpose of any particular accounting treatment. company accounts and as are seeming very important in present scenario so give little more importance to this.
tulsian is good book but you can try padhuka, it has point to point approach.
good luck