Guru Gobind Singh Indraprastha University

Since 3 months is a long time. It is enough to go through each and every topic mentioned in the IPUCET curriculum. I would recommend you to join a crash course program from some of the good and reputed coaching centre close to your home (as I would not want you to waste your time in going from home to classes and vice versa).
Now, you should consider solving this book:
GGSIPU Engineering Entrance Exam 2017 solved papers: 2016-2004.
https://www.amazon.in/dp/9386179040/ref=cm_sw_r_cp_apa_i_tVLVzbXS32R5AI would also recommend you to go for some of the best books in each subject: S. L. Arora for physics, NCERT for chemistry, R. D. Sharma competitive level for maths, but go for these only if you have enough time left with you after you are done with Arihant.
Lastly, you need to keep a positive frame of mind during the last few days and should start solving mock test papers to gain confidence and to get an idea of how you should manage time during the examination.
I hope you do well.
Cheers.

GGSIPU has just one college that offers chemical engineering- USCT (University School of Chemical technology) situated in the main campus of IPU in Dwarka. The placements in chemical engineering at IPU are pretty mediocre and hardly any top companies come to recruit at the campus. That said, if you happen to have the knowledge of the domain and are able to secure a good rank in the college, chances are good that you might land a decent job. The companies that visit the campus are pharma research and medical drugs manufacturers. Also, certain FMCG recruiters were also reported. The program at USCT is not a very old one and is still picking up. On the bright side, USCT is a government institution, ensuring a very nominal fee for the programme and thus a decent return on investment (RoI). The fee for the college is around 75K per year and it also houses state of the art laboratories.
Faculty to student ratio is also pretty good and the student life at the main campus of IPU is definitely better than it is at other private colleges.