Classes for audit will totally depend upon whether you are preparing for both group or single group. in case you are preparing for both groups its totally advisable to focus on self study as you will save time of transport and will be able to focus on the subject little more as usually coaching classes of theory paper affects preprations of practical subjects as in more likely cases passing of both groups depend upon performance in practical subjects

if you are giving only single group and assuming you have june to october i.e. 5 months than it is advisable for you to first make out whether you can develop good understanding of theory paper by yourself or not seeing your past experience because there are good books availaible like Auditing and Assurance by surbhi bansal.

and in case you think bthat you cannot make good understanding by self study than it is highly advisable to look for coaching which will suit your economic position as well as time alloted by you for second revision.

Auditing and Assurance by CA Pankaj Garg best for selfstudy purpose and also good if you use this language in examination : pankaj garg