CPT

I would suggest to go for CPT, then IPCC and you can pursue undergraduate course privately or it will be best to pursue your undergraduate course from IGNOU.
To pursue undergraduate course, and then appearing for IPCC is not a good idea. If you are going for IPCC after your graduation, then you are extending your CA completion time up to 7 years.
ICAI has signed MOU (Memorandum of Understanding) with IGNOU for undergraduate courses, which will ultimately reduce our burden.

ETEN is preferable.

You should study all the chapters thoroughly. Practice is a must for accounts and mathematics. To avoid confusion during exam, you can try to solve more and more previous year papers.

If your basics in accounts are clear, your chances of clearing the examination automatically rise. Make sure you practice the subject well and learn your theory too. Mercantile Law Another important prospect for CPT is the Mercantile Law. After accounts it is referred to as most scoring subject.

Please try again. Positive attitude, time management and smart work is the key to success.