Career dilemma

I’m in my final year and preparing for GATE 2027. I couldn’t appear for this year’s GATE due to health issues. Now I’m confused about whether I should join Capgemini (I have an offer letter) or focus fully on preparing for next year’s GATE. I have a good understanding of DBMS, OS, CN, and DSA, but I’m not particularly strong in engineering mathematics. Given this situation, would it be better to join the company and prepare alongside, or drop the job and prepare full-time for GATE? Also, which teachers or resources would you recommend for preparing engineering mathematics for GATE CSE?