Either for Biology or Maths students, practicals are the foundation for future research. All the practicals start with aim and objective, principal, methodology, results, conclusion and summary. The similar methodology will be followed in PG, Doctoral and post doc. That is why Practicals are foundation stones for future scientists/technologists. Unfortunately present education is giving least importance to the practical due to non availability of tech staff, raw material, space etc., which is in healthy condition
A better practical training prepares the candidate better for a bright future and strengthens his/her understanding for a specific subject.
So as much training and hands on session is possible the student should attend it. In Graduation student should not be choosy, rather they should train themselves with whatever relevant training they can. It will be definitely useful at different stages of future career.