Attending classes is not a criteria for getting exemption, what matters is your self study and most important is revision . At final level, one should be so thorough with the subjects that he should be able to revise a complete subject in one day(before exam) which is not a child's play, so, one sholud revise a subject atleast 5 times to be able to face exams with confidence. As far as classes are concerned , this attempt (november 13) was very lenthy and conceptual, if you are intelligent enough, do self study as many good authors are there and institute has also improved its study material but if you are not able to get enough confidence go with face to face classes, as you will be in direct contact with the teacher , thus your concepts would be more clearer