Yes, you can go for it
Hi,
As of now, only those candidates belonging to Unreserved/OBC/Specially Abled Persons (SAP) and other categories, and will be considered eligible for taking part in CLAT who have secured minimum 45% in the qualifying examination (i.e., 10+2). As you have scored 45% in Class 12, you can appear in CLAT. I hope it helps!
http://information.clat.ac.in/eligibility.html
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