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Yes, you can appear for JEE next year. In 2018, there will be only one entrance exam to give admission in engineering colleges including state and private colleges except IITs. For exam pattern you should wait for the official notification. Good Luck!!
For CDS, I would suggest you go through Arihant Path finder book. English & Maths is very simple in CDS. For General ability read maximum about Modern history & constitution of India.
One doesn't need to buy latest edition, because static topics (history, geography, science) remain one and same in
Some of the reference books you can prefer are:
Target Jipmer by Arun Kumar
Jipmer previous year Papers
Jipmer material by Arihant.
Along with NCERT Xtract book.
There is not much need for books for JIPMER. Less the quantity, matters the quality!
Good Luck.
Start with the basic books preferably NCERT's and then move for advanced books like D.C.Pandey ,H.C.Verma for physics IIT Mathemetika , play with graphs by K.C.Joshi and O.P.Tandon for chemistry.
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