Kerala

You can improve your Class 12th marks of Kerala State Board through the National Institute of Open Schooling NIOS system by these few steps as per my knowledge firstly you enrol in the NIOS board for Class 12th examination. Choose the subjects that you want to appear for improvement. Study the syllabus thoroughly and prepare well for the exams and attempt the exams and score higher marks than your previous scores. Once you receive your improved marks from NIOS you can submit them to the concerned authorities of Kerala State Board. It's also important to note that the Kerala State Board may have its own rules and regulations for accepting the improved marks from NIOS so it's advisable to confirm the process with the relevant authorities of the board.

The cheapest way to get from Thrissur to University of Calicut is to train which takes 2h13m and costs Rs.650-Rs1,400. Alternatively, you can take bus, which costs Rs.1,000-Rs1,400 and takes 2h 33m. But the buses are more frequent, and you can get down right at the University Bus Stop and walk to the Campus. On a good day, with minimal traffic and good roads, it might take around 3-4 Hours (depending upon the speed of the bus). Trains are less frequent. There might be delays. One has to get down either at Parappanangadi, or at Calicut, and then take a bus to the University. (Train Tickets cost Rs 50 for Express trains, 65 for Superfast, and 25 for Passenger). From Parappanangadi, Private and KSRTC Ordinary/LS/TT costs Rs 13. From Calicut, around 20). But trains are less risky, and better suited for those with motion-sickness. Moreover, trains do have Toilets, if the need arises.