Hello,
If you have Chemistry for all 3 years and if you want to give IIT JAM for chemistry then you can apply for this exam. Chemistry is the only subject required if you want to give JAM for chemistry.
If you score good marks then you will surely get IIT or any other good college.
Here is the link to JAM exam details
https://university.careers360.com/articles/jam
Thank you and all the best
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