Hello Santosh, 

IISER Bhopal is really a very good ranked college and if you have already secured a seat in such prestigious institute then there is no need to go for float option. As you have mentioned that IISER Tvm is also there as a choice for you then let me tell you that the Bhopal one is quiet better than Trivandrum one, so that might seem as a discarded option. But yes if you have chances that you can get Pune then it is worth a try as it really holds the legacy of IISERs. But yes Bhopal is no less than it. The final decision stands for you so be wise with your choice. Best of luck.  :)